Blog Feed: Many circuit project electronics

Logic probe tester circuit

Published on 2013-05-17 11:24:33

They are digital logic probe circuits that you make easliy. Most digital circuits that used CMOS ICs. because I like using CMOS ICs. Because it needs a voltage of approximately 3V to 12V and the power consumption is low. If we use the battery power f

Random Number Generator by IC 4017 and 4011

Published on 2013-05-15 20:17:13

This be Random Number Generator Circuit there is the character is 10 LED Flasher by use IC 4017 and IC 4011 integrated circuit. For the 4017 IC is a 16-pin CMOS decade counter. It takes clock pulses from the clock input, and makes one of the ten outp

LED Chaser by IC 4017 + IC 555

Published on 2013-05-15 19:50:07

I believes in that extremely amateur electronics many you, may ever build the LED flasher or light blinks or the LED Chaser prevent come to already. Today I begs for to advise the circuit LED Chaser, by have LED show 10 amounts together. blink stick

10 LED Flashing using CD4017

Published on 2013-05-15 19:44:46

This the circuit light led flashing with show of 10 LED. By use integrated number circuit CD4017 perform be Decade Counter/Divider with 10 Decoded Outputs. Which it is integrated digital circuit CMOS then use the power supply about 9VDC. For a signal

Symmetry harmonic oscillator generator

Published on 2013-05-10 00:36:50

This circuit is simple harmonic oscillator generator that easy because use three transistors as main components that In this modern era, look old-fashioned, but if you have a device in hand, should be created be used. Highlights of this circuit, not

Variable zener diode circuit

Published on 2013-03-22 12:29:13

I used to design and calculate the value of the equipment. By false starts. Frequently have all the equipment. Except that the Zener diode can not find what you need. I tried using this way. This circuit features as zener diode voltage can be adjuste

Simple capacitance measurement using IC-555

Published on 2013-03-16 23:54:44

This circuit is used for the frequency counter as digit number display, that can measure the period.To show a capacitance value of the capacitor directly. According to circuit shown in Figure 1. Shows the using IC 555 as astable multivibrator. Period

Amazon is a us new Hope.

Published on 2013-03-09 10:14:56

I started to study and experiment with amazon affiliate program to earn money, instead of google adsense. Over time one week I check income about 9.24$ or daily average sales of 1.32$, which may be less than the income from google adsense. However, I

Let’s assembly a good Elenco Digital multimeter.

Published on 2013-03-06 15:24:57

As before, I think a Digital multimeter is a tool that we cannot build itself. Because needs high accuracy. Must have Tools to compare more expensive. But when I saw the product Elenco also must very surprised. Here DIY Kits is a digital multimeter f

How to repair a TV-LCD and more electronic circuits

Published on 2013-03-05 01:58:54

About 7 years ago I used to a TV repair shop in a small town. It are the freedom job and good income. Although I graduated in electronics. But, I can not repair the TV. At that time, I will learn short courses. Expensive and takes a long time to lear

Live by the Google, die by the Google.

Published on 2013-03-03 22:36:19

Hello everyone. Honestly, I’m doing this site to earn income. But now google adsense banned account me. I not have money for my family. During last time about 6 years old. I really impressed. I received a attention from the web site visitors to

Super AC dimmer using IC-555& triac

Published on 2013-03-03 13:34:58

The super dimmer it is certainly better than the normal dimmer you are using now. It would be better, however, to try to prove it. Let’s see how it works circuits. The working principle. The super dimmer circuit is shown in figure 1 is a circui

Cheap Koolatron Compact Kooler for car

Published on 2013-03-01 10:42:31

If you live on a car is long time Such as long trip. Should to have Koolatron Compact Kooler on your car. it very useful to keep food and drinks cool while traveling.(Keeps contents 40 degrees F cooler than outside temperature) It use 12 volts from y

DEWALT Inspection Camera Kit for repair shop

Published on 2013-02-27 13:36:29

My friend is a professional automotive technician a good income. But he did not work in large companies such as Honda service center. He opened a repair shop in a small town.He complained to me that sometimes it is hard work.Particularly difficult to

Multi function frequency meter 0-100MHz using ICM7226B

Published on 2013-02-21 05:53:02

The Multi function frequency meter is an instrument that can measurement many things in a single display with LED 7 segment 8 digit. The controls measures sector as well as the display is used a single master IC. Is A good IC of Intersil Corporation.

RS-232 to RS-485 converter circuit usin MAX487

Published on 2013-02-20 11:34:45

RS-232 system connection faster and easier, But distance is not far. so to change to use the system RS-485 with this RS-232 to RS-485 converter projects. It is highly effective. And savings. The communication between computers together. or computer a

Small AM portable radio using CIC7642E

Published on 2013-02-20 08:35:43

“Compact portable AM radio with plain headphones.” You’ve probably seen a small radio with earphones. You can put it in your pocket. This project is similar, but the small little device. Its easy customization. And certainly cheaper. How it

4 digit sensor counter using mcs51-AT89C1051

Published on 2013-02-19 23:01:31

This is a counter circuit that I would like to you view an another form of concept. The most counter circuit that is often used in industrial applications such as object detection and counting. This project uses a sensor to detect objects that pass t

Digital timer controller 0-99 second using PIC16C56

Published on 2013-02-19 06:28:38

After we had a timer in various forms. For example : the RC circuits or using IC generat and frequency divider. This time we try to run some microcontroller IC. The advantage of it is that we can assign different effects to it, and many other applica

Diy fiber optic intercom

Published on 2013-02-17 18:32:55

This project was proposed. Is basic principles of signal transmission through a fiber obtic in a simple and saves. A simple communication systems to home use. Video Door Phone Intercom is going to happen in the future. or Meetings monitor route. via

Cheap alcohol tester circuit

Published on 2013-02-14 04:03:44

My friends who live in California, USA, said that he likes to party with friends. With alcoholic beverages. And the need to drive a car. He does not want illegal traffic and to ensure the safety of everyone, so thought to buy this alcohol tester to t

Dynamic Microphone Preamplifier using C945 transistor

Published on 2013-02-13 04:11:49

If friends are looking a somple audio amplifiers for a dynamic mic is high quality. So the low noise signal. I suggest this circuit because It use the three transistor (2SC945, or 2C1815 or 2SC828) is main Which typical transistor amplifier with a lo

Car overheating alarm

Published on 2013-02-12 21:37:03

This is a circuit sound alarm when an engine start spreading the heat. Although every car will have a temperature gauge. But in some cars. May be no warning if the engine is overloaded with heat. Or the driver may not have noticed the temperature gau

12 volts switching power supply using transistor

Published on 2013-02-09 00:55:59

One of my friends asked. Can we build the switching dc power supply circuit with 2 transistor? The applications IC that Sometimes is difficult. A some number IC is hard to find. and very expensive. When considering Applications for some time. We do n

12 volt DC motor speed controller with pulse

Published on 2013-02-08 10:42:24

Usual, we just enter the voltage and DC current source to the DC motor, Makes motor can be rotated. If will modify or regulate the speed in rotation of the motor. Wewill need to enter the voltage look into pulses or periodically. Which will makes the

Sun light control automatically using SCR

Published on 2013-02-07 06:53:20

This circuit controls the turn the power off consumption in home automation. If it is daytime working to break the circuit. But at night is connected to a working electrical AC 220 volts. Such as the opening and closing of the bulb. This lamp will il

Small RF universal remote controls

Published on 2013-02-05 04:58:58

This small Radio Control (RC) circuit is easliy. It can install with a toy train or automobile that used a voltage supply from 6-12 volts. Which the radio receivers sectors is installed in the car will turn on – off the DC motor runs by forcing

The PIR Movement detector with light-activated

Published on 2013-02-03 18:10:18

Car Burglar system with start delay

Published on 2013-01-30 01:34:13

This circuit can prevent a car theft. By the delaying them, not to steal our cars easily. Which can use in both cars and motorcycles, that uses a battery 12 volts and also cheaper too. The working principle. In Figure 1 is the Car burglar system with

The 2 channel DC motor driver circuit on a saving model

Published on 2013-01-21 05:16:40

This circuit has 2 input and if both it’s input is “1” (+12 volt) What will happen?, If some input voltage is “0” (such as input A) transistor T5 will conduct a current and as cause to transistors T1 and T4 also conducts, and makes the

The cheap frequency meter using CA3130 and LM555

Published on 2013-01-14 22:02:40

The electronics are still used to use a frequency generator circuit beuause It is important. And are used a lot in electronic circuits, both sine, square wave and more. In every time related to the frequency. What that we want to know is how much fre

The Infrared receiver circuits using LM1458+CD40103

Published on 2013-01-13 01:04:14

From Infrared Remote control transmitter by IC-555-BD137. Let’s build the Infrared receiver circuits. Which has too much circuits. Starting from a simple circuits as Figure 1 first. We will see that a photodiode is connected in the reverse bias

The Electronic Thermometer LED display and versatile control.

Published on 2013-01-12 03:45:27

Technology does not stand still. This electronic thermometer that display by LED 20 level and The peripheral Bells Alarms. When the temperature reaches the preset value. On a daily basis. We have to work a lot. If someone would have noticed and remin

Let’s build a simple digital meter circuit using ICL7107

Published on 2013-01-10 09:15:29

Lets build a digital meter used today, I would tell like this. Because now building the digital meter is not difficult to use high technology. Or much money at all. With a single IC and a small number, along with the LED lamp size 3 digit 7 segment o

The LED display voltmeter in probe model

Published on 2013-01-08 22:50:27

When we had to leave the place, then it is necessary to measure DC voltage. If we carry all the time a multimeter. Feel too large. I think built volt meter probes compact in a pen form. To the time required. How the circuit works In the figure 1 is c

Super dancing AC lights 4500 watt using opto isolator

Published on 2013-01-07 12:45:07

I am extremely proud to present to you this circuit. We dare to challenge that. When you have contact with the circuit. You may have forgotten to do another circuits. In addition to the ability to work resolutely. The circuits is designed. With safet

The cheap & small hearing aids project.

Published on 2013-01-05 11:20:31

This cheap hearing aids project or the small listen booster is a simple function similar to the function of the common audio amplifier. The work starts with a preamplifier circuits, the light and amplifier. To be the stronger. To receive audio signal

300 watt – 1200 watt MOSFET Amplifier for professionals only.

Published on 2013-01-04 07:27:15

When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both Loudness and durability, that courage to try. For this circuit, typically the maximum watt power

0-60 volt DC variable power supply using LM317&LM337

Published on 2013-01-02 07:26:43

If you want a power supply that covers most applications. This circuit may be what you’re looking for. The price you deny difficult. With the following features. 1. On signal mode can supply DC voltage between 0 volt and 60 volt 2. Can provide

Let’s to build a mini organ keyboard circuit using UM3511

Published on 2012-12-30 23:06:56

The previous day my son said ” A friend has a mini organ. Casio SA-76 44 Key Mini Keyboard, Orange It is Good quality but expensive. My son would have the same. But I said, as we are the Electronic inventor, to try to create their own. We are proud

The food salt & salinity tester meter circuit

Published on 2012-12-29 07:32:36

A Salt intake in large quantities is not good for the body and also causes of diseases such as kidney disease, high blood pressure, heart disease and paralysis. We should not eat too much. But the recognition of salinity, but may differ. Therefore sh

High quality tri-amplifier circuits with crossover network built-in

Published on 2012-12-28 00:55:32

A tri-amplifier has three in one a amplification act drive specifically each audio speakers makes the sound quality is very good. Normally amp can drive three speakers at the same time are the woofer, mid-range and tweeter. Which may have limits such

Cheap led christmas light flasher circuit is controlled by audio

Published on 2012-12-21 06:51:52

Those who are looking for a unique gift of sorts for Christmas and New Year. Certification this project create a predilection certainly for the recipient. This project is designed to meet the needs of create particular project. In order to get the Ch

DIY The wireless video & audio signal sender circuit

Published on 2012-12-20 00:22:35

If you want to send video and audio signals are spread to multiple televisions simultaneously. You may use a Video amplifier splitter by transistor BD137-BC547-BC557 circuits. But it is limited. The need for wiring and is only about 4 set only. Let&#

Multi-Melody Generator with Instrumental Effect by CIC2850 Series

Published on 2012-12-17 00:01:32

You will never be bored Simple melody generator circuits. They are very useful for adding color to various electronic projects. Let’s say you build a sound the alarm in the morning with their children. If you use siren to warn children not appr

A versatile and cheap digital counter circuits by CD4510 & CD4543

Published on 2012-12-13 13:27:57

This is versatile digital counter circuit, that as a cheap due to basic components you can buy in many electronic shop. My friend said the some circuits that price same this circuit may be not worth it. You can apply too much model as you want with s

Ultrasonic motion detector project with versatile controls

Published on 2012-12-11 00:54:16

New Year is near! Is a festival of happiness. My family and I planned to go to the province for several days. Leaving the house for days may be stolen our property. I decided to buy or build the project Ultrasonic motion sensor project with versatile

Regulated DC power supply variable output 0-60V 1A

Published on 2012-12-07 08:00:49

This 0-60V variable voltage regulator power supply circuit is designed to supply the output voltage to zero volt, without a transformer with a secondary winding two coils. We can use the well-known IC is LM723. Or if you want to pressure is higher, u

Triangle wave generator circuit with cmos inverter IC

Published on 2012-12-06 20:54:50

This is a very Function Generater project. can be used Triangle and Squarewave Generator. The main parts are CD40106 popular CMOS IC and a normal transistor is BC547 or NPN type such as : BC549 , 2N3094, 2SC1815, OR an Old number 2SC458 . VR1 For Con

DIY infrared remote extender circuits

Published on 2012-11-30 00:25:43

We use the DIY infrared remote extender circuits to control the satellite receiver from any room in the house.With a single receiver.Save money not having to buy additional equipment. Now the satellite receiver are steadily increased popularity. If y

Simple preamplifier circuits by transistors

Published on 2012-11-21 01:04:12

If we want good quality sound system,the first thing to consider is that a good pre-amp. Some people say that’s not necessary. But when the low-level audio source. We may need to adjust the sound too high will cause distortion. so should have t

Cheap microcontroller training package by 68HC705

Published on 2012-11-16 23:10:21

The microcontroller IC is a device that looks like a common IC. But inside it, the virtual a miniature computer. This device can be used instead of transistors and IC older those. 40 years ago Electronics fields used the transistors and ICs were equi

Let’s to build many VU Meter circuits with LM3914

Published on 2012-11-16 01:05:06

I make a lot of amplifiers. Because I like to listen to music. And a VU Meter circuit is a circuit that I like it. In addition, it is used to display the power level of the audio, it also is beautiful. Many friends, would prefer same me. When you go

14 watt Stereo amplifier OCL by TDA2030

Published on 2012-11-10 03:43:44

This power amplifier series have disposition in circuit as OCL form is stereo system provide power driver of 14 watt / channel at load 4 ohm. Suitable for beginners thought will build the electroacoustics to listen yourself. This project use IC of Th

Most common emergency sirens circuits

Published on 2012-11-01 17:45:03

The siren circuit is what importance in various alarm. For example : the emergency alert, burglar alarm circuits, Fire alarm circuits, Timer , sensor controls, etc. If we have not these circuit, We will not able to recognize the functionality of the

Melody and Music tone generator

Published on 2012-10-31 02:41:53

This is the Melody and Music tone generator circuit which I think is useful for adding color in the electronic work is good, Can be applied to sound an alarm, or assembly electronic projects very well. Examples circuit that I suggest, is a switch for

Three music box circuit ideals

Published on 2012-10-31 01:33:28

Near the Festival of Happiness.Christmas and New Year’s Day. My son was thrilled with the gift of friends in the village.Music Box is a scientific inventions that he wanted made because he thought it would impress the recipient. And it is easy made electronic projects. Cheap as well. I suggest three circuits, which featured various By the application of each person. Music box versatile using IC M3481 This is a multi-purpose integrated music box that interesting, because an IC package. Is a [..]

Many simple door buzzer sound circuits

Published on 2012-10-30 20:47:28

Have you ever had a problem with the front door bell or not? Are, I am boring old buzzer. When used with directly AC line.Danger of leakage power in the heavy rain. And, doorbell quality is very expensive. I think we try to make yourself better, strange sounds a unique. Cheap equipments. And high performance. Because we have Choose circuit. I collected many of circuit as follows . 1. Door buzzer with 555 This is easy circuit buzzer. It use IC 555, Speaker 25 -80 OHM. I demolishes a store-room , [..]

Plant soil moisture meter and automatic controller circuit

Published on 2012-10-30 00:44:41

I like planting trees, because trees are more useful to us. However, I always have problems with moisture content of soil,Each plant needs water is not as same. Watering or soil moisture is not good. May cause damage to our trees. With these problems, I think the electronic system to solve this problem. For example, to check moisture level of the soil. We see from the outside, may not be good enough. Sometimes we see that the soil is dry.But it may be appropriate to plant moisture that, when we [..]

Many Logic probe circuit ideas.

Published on 2012-10-29 10:33:11

Logic probe is useful tool to measure, in a check digital circuits. As a meter, which is used to measure power in electrical circuits. Logic probe was used for detection logic “1″ and “0″ or pulse in a digital circuit. It has a handle. At the head of a pin, for measuring different parts of the circuits, or IC pin. At handle has a state of the LED display, as a “1″ or “0″ or pulse. Before use, to connect the two wires to pinch the power supply. To p [..]

Simple Voltage Indicator by LED and Zener diode

Published on 2012-10-29 02:48:33

In electronic instrumentation is needed.One friend of mine, once said that a good tool. Not need to be expensive. It is important to use enough. Today I will try to collect circuits Simple Voltage Indicator. by LED and Zener diode You look into the concept. Although is small circuits. But it might make circuits great work was complete. 1.Visual zero beat indicator This circuit is suitable for an indicator to audio signal lower than 3Vp-p. In the circuit, we use a very small parts with only two o [..]

Make solar aa battery charger by TL497

Published on 2012-10-21 01:09:15

Let’s build a small battery savings. In an era of expensive energy better. In an era that energy is more expensive every day. Alternative energy is a good solution, to solve immediate problems, or renewable energy to do the work well. Solar energy is an alternative that we can use another kind. For this project, we use it to charge a small battery, we must first understand the working principle of the circuit before. How it works. Battery charger with solar cells consists of three parts ar [..]

The small electronic drum by MC14046

Published on 2012-10-18 18:16:30

In this high-tech generation, the style of music, inevitably have a profound exotic. And harmonic rhythm techniques with much more satisfied than before. Which this small electronic drum project is Instrument of this era really, It can be applied to the various sound effects and many others. How it works. Main idea, we use a loudspeaker instead a Microphone. Knock on the front of the speaker, makes speaker cone to vibrate, causing a small electrical signal up. This signal was amplified and stron [..]

Small uninterruptible power supply-UPS circuit

Published on 2012-10-13 17:17:01

This small emergency backup battery systems circuit can be applied to many applications, when the power goes, the battery can provide backup power automatically. This power supply circuit system consists of a transformer, a bridge rectifier and an electrolytic capacitor. And there is a zener diode for controller the output power transistor(BD135 NPN) of this circuit, and will be determined at a constant voltage of 7.5 volt. The Backup battery 7.5V(1.5Vx5) in series with D2 and both are connected [..]

Cheap car subwoofer filter circuits

Published on 2012-10-02 00:30:19

This subwoofer filter set Suitable for use with a great car audio system. Since this circuit is designed to operate with a 12 volt DC power. But if you put it to use with a home stereo, It do not have any rules. This subwoofer circuit set is designed to has a cut off frequencies of 200 Hz. If you are not satisfied, you can change the C6, C7, C8, new, follow the table below. Cut off frequency piont C6 C7 C8 60 Hz 0.56uF 0.47uF 0.039uF 100 Hz 0.33uF 0.27uF 0.027uF How it works The left cannel inpu [..]

Cheap FM tuner by TDA7000

Published on 2012-09-26 15:59:40

In the old days, common people will build radio receivers FM, himself, as very difficult, and once completed, also low efficiency. But now, the complexity of these circuit are collected in a single IC. When taken together with the other accessories minimal, then can receive a clear FM frequency. The FM tuner is radio receivers, which receive signals from radio stations. For the tuner, which will be presented at this time, as small radio receivers, But is not less than the tuner to use quite comp [..]

100 watt DC servo amplifier by Power MOSFET

Published on 2012-09-24 01:50:40

This is circuit MOSFET power amplifier OCL, Output 100w , use mosfet k134+j49 or Mosfet J162 + K1058, Output 112W at Speaker 8 OHM. Power Supply +56V/-56V 4A /Ch. For those who want to profanities fun. This 100 watt power mosfet amplifier series be able to you for sure. And can have a most sound frequencies response. If You think that, I say the truth, then invite you to consider this Circuits. And build as needed. How it works From a first circuit, will seen that characteristics of the circuit [..]

The subwoofer simulator by LF347N

Published on 2012-09-22 09:57:37

Almost everyone like sound realistic, particular the low frequency sound signal is system that commonly widely used. With how to bring out the low frequency signal. from amplifier circuit both left channel and right channel come Enlarge together, And then enter to speakers are designed for Low Frequency, particular sound from the subwoofer speaker, will cause the sound system vibrate up. But increased sound quality. Inevitably requires a more money as well. How it works But for those who has les [..]

The experimentation of 2-bit binary counters by CD4027-SN7473

Published on 2012-09-22 00:52:48

We are experimental to create a simple counter circuit today, is a 2-bit binary counters. Which consists of the gate and flip-flop both of TTL-IC type. We use the ICs are NAND Gate number: SN7400N and the flip-flop No: SN7473N, which consists of JK-FF two pieces. We use only one at a time, so can try it on the counter. Experimentation - Build circuit as Figure 1. The NAND Gate 2 pieces in IC-SN7400N connect as RS-FF(a flip-flop) for one pulse when we press switch one time. For JK-FF both in the [..]

Microprocessor dc regulator supply 5V 3A by LM323K

Published on 2012-09-20 15:01:51

Those who want to have the power supply circuit for use in experiments such as logic circuit and/or the Microprocessor types that use voltage size 5 volt And the amount of current consumption very much. This circuit will respond your needs did well - Due to this circuit is very simple with the IC-LM323K (or LM123 or LM223) only one. But the can supply 5V fixed output voltage, and can be connected load current up to 3 Amp. As shown in circuit Figure 1, will seen that the IC LM323K, only one. How [..]

Micro mixer circuit by TA7137

Published on 2012-09-19 03:42:37

If you are looking for a micro mixer circuit that create a simple, affordable, small and compact, and be usable versatile, must be this circuit. We can use to mix up to four input channels such as the microphone signal, FM Tuner, AUX and Other signals, As circuit shown in Figure 1. How it works. The input signal Input signal in each channel is entered through R1, R4, R6, R8, respectively, to potentiometer VR1-VR4. which is Adjustment value of Signal in each channel is the right size. Then is ent [..]

0-70 Volt 2 Amp DC variable power supply

Published on 2012-09-18 20:18:15

When you want to adjust the dc power supply circuit voltage up to about 70V. But the “Cheap adjustable 0-30V 2A Laboratory DC Power Supply” project can fine maximum voltage is 30 volt only. We need to add more 40V. You do not look difficult. We can adapt very easily, with the addition of just two devices only, and change in the value of equipment a little more. How to modified this circuit. When we consider from the original circuit. We can modify this circuit with cutting at point A and B a [..]

Bass guitar super bridge amplifier 200 watt.

Published on 2012-09-17 14:09:16

If You want to circuits amplifiers for bass guitar, or for using in every situation such as both listen to in the house, outside the house or outdoors. This circuit is answer that you is looking for. It is wisely designed with power output at 200 watt in super bridge model so help to you have a high quality circuit in cheap. The characteristics of the circuit as shown in figure 1. When we carefully consider found that amplifier circuit consists of two sets are: - The first circuit set consists o [..]

Cheap adjustable 0-30V 2A Laboratory DC Power Supply

Published on 2012-09-16 02:54:27

This 0-30V power supply is the variable voltage Regulator at 2A max, by used IC-723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 2amp. It suitable for general electronics work shop. Because it is a simple circuit and easy circuit. In addition to this has the over current protection as well. This circuit is designed using LM723 voltage regulators IC –DIP 20pin maintain a constant voltage, and a power transistor as the way through the current to can [..]

Cheap Digital time clock with alarm circuit by LM8560

Published on 2012-09-15 05:57:45

The digital time clock is circuit that electronic amateurs are most interested. And The clock ICs that most popular are LM8361, MM5387, Unfortunately these ICs looking for will be difficult. I highly recommend this clock circuits features to work for less than the original circuits. But there are advantages due to have output in Duplex LED display model, so reduce the number of wires between IC1 (LM8560) and LED display was 2 times more than the original. How it works In this circuits, the heart [..]

A on-shot circuit ideals

Published on 2012-09-14 08:31:02

The digital circuit additional a circuits taht is very useful is On-Shots circuit or Also known as Mono-stable multivibrator circuit. This behavior is the input trigger signal into just a single pulse,which is usually a lot of thin or narrow. And then this circuit will output is pulse out there. But width of the pulse width can be set to a value more or less. As needed with configuring the device in circuits. There are several characteristics of this circuit, which I gather is the following. Sim [..]

20watt Integrated Amplifier by TDA2005

Published on 2012-09-14 02:23:44

This is small integrated amplifier that many people link it. We use one TDA2004 or TDA2005 IC to increate very nice sound for really beginner. - Many of you would have made a small amplifier. With low are expanding. But the sense that sound loud not satisfied. Need to look for higher power amplifiers. - This the amplifier series, able to respond the demand by are expanding to 20 watt. You can adjust the volume, bass, and treble as needed, plus not too expensive. How it works The heart of this pr [..]

Super stereo digital echo by KT5211P

Published on 2012-09-13 03:30:46

This stereo digital echo project is circuits pioneering in the use of the old echo circuit before using the IC-BBD to the digital system. By using a digital echo circuit IC designed especially for the heart to work. This circuit is designed as a stereo system, to make it easy, and easy to-use applications, with your amplifier, followed circuit below. Be seen from the circuit, is quite simple consists of the main equipment are 4 transistor and 5 ICs only. The working of this circuit The left chan [..]

Small stereo amplifier circuits by ICs-easy to make

Published on 2012-09-12 21:36:40

This is a small stereo systems amplifier circuit.Running on battery power. a small speaker is comfortable, durable and economical. My wife likes to listen to very much music.She likes listen to everywhere when the opportunity. I bought a small MP3 player to her. I used to listen to music with headphones only small. When we have a baby so want to is connected to a small speaker. So I looking for a little two speakers systems amplifier circuit. ++++++++++++++++++++++++++++++++++++++++++ Mini-stere [..]

My first Variable DC Power Supply 1.2V to 30V 1A by LM317

Published on 2012-09-12 13:23:02

If you are beginner in electronics and you want to have a great power supply. This project is design for you. It can supply voltage 1.2V to 30V at all range is 1A. This is the First DC power supply in my life that made to use in many projects. It is ideal for those who want to adjust voltage from 1.25V to 30V and currents up to 1A. Which is sufficient for normal use Such as is power supply instead of an one 1.5V AA battery or when you want to listen to music from a 30-watt amplifier that require [..]

The cheap 100 watt transistor power amplifier project

Published on 2012-09-12 02:09:09

This Power Amp OCL 100 watt circuit by transistors.They has been an old circuits, but very well amplifier schematic. We use only all transistor MJ15003 and MJ15004 is the main in circuits, and the power supply +38V 0 -38V 3A. follow stye of OCL amp and They has Specification are power output : 105watt at 4 ohm load, 88watt at 8 ohms load input sensitivity : 0.5V Frequency response : 10-10kHZ +/- 1dB THD: 0.07% at 50 watt , 0.1% at 100 watt. This power amp OCL 100w is a very excellent sound quali [..]

Best DC power supply 3Amp to adjust 1.2V-20V & 3V-6V-9V-12V

Published on 2012-09-12 00:08:47

This is the high quality power supply to provide high current 3A. And still adjust voltage in steps from 3V, 6V, 9V, 12V. adjust voltage is continuous 1.25V to 20V. Using LM317T and 2N3055 are main parts so easy to made and cheap. Friends would known the power supply as well. Because you must use in various circuit experiment. It originally had a small supply current, when found projects that uses lot of current. Such as an audio amplifier circuit so provide current is not enough. This project c [..]

The main amplifier 50 watt OCL by LF351-2N3055-MJ2955 with PCB

Published on 2012-09-11 02:48:56

This main amplifier 50 watt OCL circuit has high quality and economical. Because it is designed simple, It can be easily created in your friends, An electronics rookie. And cheap when compared to other speakers, the as same volume level. The main power amp. This circuit is designed in such a way “Direct Coupling All Complementary IC Drive” will be seen that, the heart of the circuit is IC1(LF351), are the differential amplifier and pre driver circuit. Note: I chose LF351, because the noise r [..]

Wide stereo system circuit by TL082

Published on 2012-09-10 02:53:33

Added dimension to get sound of music wider stereo system. Suitable for, you are tired of the original sound. I’m not making you uncomfortable with electronic projects difficult, and expensive. This circuit enhances the Joy of musical level. The principle is easy to understand, and with a simple, inexpensive equipment. The love of the instrument, do not miss this project. Before building, I understand the principle well. The working principle. -We will feel that Sound has the width more de [..]

The most lead-acid battery charger circuit by LM317

Published on 2012-09-09 00:17:11

When you want to create form lead-acid battery charger circuit. Although there are many methods to choose from. I like using IC LM317 Because easy to use, with minimal equipment. Cheap and good. Today, I try to collection ideas for the battery charger circuit. This is just part one. There are many circuit. 6V or 12V lead acid battery charger using LM317 This circuit be lead acid battery charger again interesting circuit, Because it can charger get both of 12V sizes and 6V. By change with switch [..]

High power mosfet amplifier circuit ideas

Published on 2012-09-08 03:33:21

The power amplifier circuit using MOSFET has been very popular, because the sound is very aggressive, as compared to transistors and ICs. It can be low-frequency and high-frequency response as well, it is highly durable. Usually, if compared with the same sound. It will devices less. Due to the bias the voltage. Easier to control current. But some people say. If the power MOSFET output loss, more expensive power transistors. I agree with this, but,Is it not so bad. Today I have circuit collectio [..]

Small 5V regulator

Published on 2012-09-07 12:26:59

When you have a small power supply for digital experimentation. Everyone will tell you that the number of IC 7805 best buy is easy. Is commonly used, because it is easy to find and inexpensive. If you feel tired it, want to try to create a circuit with IC or a transistor is interesting. It allows us to save. The old transistor. Or number you already have. 5V lab power supply Friends at like to experience is digital circuit has evered to get into trouble have no 5V lab power supply ? In time want [..]

Small IC amplifiers for speakers

Published on 2012-09-07 00:56:40

Today I have collected a small amplifier IC. Most of the old series. It is a simple circuit OTL series, mini size capacitor chupling to small speakers. -Found in Small electric appliances such as TV, radio receivers, tape player, radio, toys, etc. -But sometimes you may have to repair it, or perhaps you might be stored in the power storage. The idea was to create the best sound amplifier. And use less power supply so secure, that. I hope this is helpful to you. Power Amp 6w With IC TBA810 This b [..]

Three circuits of preamp tone controls by NE5532

Published on 2012-09-06 22:53:06

The NE5532 is very interesting IC, because the ultra-low noise properties, it is commonly used in many fine audio. I have been three old circuits from my friend, it has been small circuit with PCB layout. I hope them will be useful to you. good luck, thanks. Pre Tone Control Stereo by IC NE5532 If you want Pre Tone Control Stereo circuit good some. I begs for to advise this circuit. Because use IC NE5532 make build and high-quality,price be inexpensive extremely. By this circuit can fine the bas [..]

Ideas circuit of small transistor amplifiers

Published on 2012-09-06 21:42:55

Currently, ICs has been used in many audio amplifiers,especially small circuit. It is convenient to use transistors.But when you need to use transistors, it has several advantages, such as saving you can take old equipment come to made small circuits easier than the IC. Which may be difficult to find. Take a look at these circuits. Maybe you get the idea of it. Power Amplifier OTL by AC176+AC126 Mr Somsak is my friend who like to make power amplifier so much. but he do not well electronic man. I [..]

The many ideas of 100 watt amplifier circuit

Published on 2012-09-06 07:49:53

A friend takes an interest to want to try build hi-fi power Amplifier the some one. He likes model class AB , because the sound is good. keen bass good distinct.I chooses this circuit gives him sees , be power Amplifier hi-fi OCL 120W rms sizes really,if use power supply circuit at enough good and use 8ohm size prominent point interesting loudspeakers. Of the circuit be use the transistor entirely have no the integrated circuit mixes. Then make bland good sound , for power supply voltage should [..]

Cheap Home disco lights by SCR-IC555-IC4017

Published on 2012-09-06 00:58:10

This is a cheap Home disco lights circuit. Friends like listening to Rock music,would like these circuits. It enhances your music listening more colorful. Will see that, we use the SCR is a notable parts. and used the music to controlled lamps easily. 6 Light Running by IC 4017 and SCR Today I begs for to advise 6 Light Running Circuit. It suits the festival for the beauty and good strange-looking. It use IC 4017, IC 555 for Pulse Generator give with IC 4017 Display Lamp with SCR Circuit. FOR Dr [..]

Audio generator is controlled by light

Published on 2012-09-05 18:24:33

These circuits is used to control audio with light. In simple transduction And the change of light. To control the tone.,we is recommended that three circuits, each circuits consists of a simple device. Suitable for studying the performance of optical sensors is LDR. Light Dark Detector Alarm by IC 555 Today we come to see the circuit detects the light by have a voice warn. When meet the light or be become dark depend on using S1 ( follow the circuit ). For this my circuit uses the integrated ci [..]

The old pc power supply circuit

Published on 2012-09-03 02:17:13

A good DC switching power supply circuit form old computer that not used. It has used powerful, durable and works great. Present, a computer become the electric appliance power needed for every home Because there are very useful. But lifetime limit and out of date very quickly. There are new program. Desired machine that has high efficiency. You can always change the new. (To a modern). -Where is the old computers? Most probably it will be discarded as spam. This may be very valuable for many pe [..]

2 channel 100W min AF Power Amplifier (Dual Supplies) STK4231II

Published on 2012-09-02 23:33:11

If you want to create the 100 watt OCL audio amplifier circuit. I want you to consider this circuit as one. It uses STK4231 IC products to create a simple, small and best economical. How it works. The STK4231 is Hybrid IC of Sanyo, in the family of STK4201II. Can provide a high power output to 100 watts per channel. And When connected to the bridge adapter with output altitude of about 400 watts is incredible. -Built-in muting circuit to cut off various kinds of pop noise. Greatly reduced heat s [..]

Infrared Remote control transmitter by IC-555-BD137

Published on 2012-09-01 14:26:20

This is Infrared Remote control transmitter circuit has high performance and can be applied to works with the various infrared receiver circuit. To made easily. And best to save your money. I need not tell you much, what is the infra red remote control. Because you have known as well. so I recommend circuits 2 types, as appropriate. - The first is simple circuits. Infrared light from a set to a set to work immediately. - Then another circuits, is designed to have wider applications. Can be set p [..]

Flyback transformer tester circuit using 2SC828

Published on 2012-08-26 08:34:34

The circuit tests a flyback transformer of the televisions that the result is a simple, easy and cheap to build. One of my friends is TV repairman colors – black and white. He said the repairing on the fly back is very difficult. Because it has large size, Is high voltage source. So is very dangerous. - When the assumption that it is damaged. It’s not easy to testing. Need to know what the working principle, and a great tool. To reduce expenses and time. Its internal structure is mos [..]

Crystal tester circuits using BC107

Published on 2012-08-23 07:57:43

You cannot use a multimeter to check a crystal. You should have a this circuit, because it can check a crystal 100Khz to 900Mhz, easily to make and cheap.The crystal is a key equipment used to generate a radio frequency. - Some circuits use a clock signal controller. For example, The digital circuits of computer system. And widely used in quartz watches, both pin and the numbers family. - This crystal determines the accuracy frequency and widely used in the present. -External shape of the crysta [..]

Cheap emergency lights using D313

Published on 2012-08-22 14:46:19

If you ever feel annoyed when the power failure while a working or a business. and in important area. Such as: the way up the ladder and in the bathroom could be dangerous, or shops at night you might be case it gets stolen the products. Emergency lighting is necessary to replace the main light during power failure. Internal emergency lights will have battery backup. As usual This circuit will charge to stored in batteries. But when the electricity failure, it does the opposite is the battery wi [..]

The many DC to DC converters using IC-555

Published on 2012-08-19 06:48:05

If friends would to want the DC to DC voltage converter is small that has a few output current. I would suggest the IC-555 is a key equipment that it is popular and easy to uses so can be used in many circuits. Doubler voltage 12vdc to 24vdc with NE555 This be Simple Doubler Voltage circuit, from voltage 12VDC to be 24VDC. By use Timer IC highly popular the number NE555 and other equipment a little again. It can give current get about 50mA convenient for the circuit, that use low current the sma [..]

Transformerless AC to DC power Supply circuits

Published on 2012-08-17 11:30:39

I often make small projects. However have problems to find a small power supply is not. The problem is not to find a small transformer, However it is big and heavy. Not suitable for my project. But I see in the small appliance production in China. Do not widely used a transformer. However like to use a capacitor replace. Which it smaller and lighter than a transformer. Today I collect these circuits, so you can select to use in required. Hopefully it will be useful to you. Power Supply 9VDC no t [..]

A lamp flasher circuit using transistors

Published on 2012-08-16 22:59:20

If you want one small lamp that flashing for general to use. I have many ways, But today you see this three of the lamp flasher circuits. Which it has highlights is there are two types of transistor are NPN and PNP. It can work as well as the use of IC-555 or other transistor circuits. It can work as well as the use of IC-555 or other transistor circuits. In order not to waste time , come to view and join these circuit. Lamp Flasher Current 1A We come to see Lamp Flasher Current 1A that apply to [..]

Automatic water tank using pump controller by 2SD882

Published on 2012-08-14 22:09:14

The automatic water tank by pump controller allows for a convenient and cost effective. In the countryside, Water is very important. The most to use the groundwater to dig as pond, and for the convenience, They often use the pump automatically, But waste a lot of electricity. Some homes have a large water tank on high, then Pumping up the put on hold. When you want to use, just to turn on the tap at the bottom. It does not require all time electricity and also high water pressure. Water tank sys [..]

Fan controller by temperature sensor using LM393

Published on 2012-08-13 13:29:29

A guest who visit my site would like to create a project about the control on/off the fans with based on temperature automatically or Simple fan on off controller by temperature sensor. I would like to introduce the concept of this circuit. You probably know that, Useful fan when the weather is hot. But cold weather, fans are not very useful. If we turn the fan on sleep then at night is cold. We get fan the whole night still feel unwell certainly . If you use a timer, may not be exact. Sometimes [..]

Whistle activated switch using UM3763

Published on 2012-08-13 00:50:26

Surprisingly much, can turn on – shut down electric devices with a whistle sound. This is simple sound control circuits, that different from a little common circuit is Requires high frequency noise Such as whistle sound etc. The heart of working in this circuit is IC1 (UM3763) that is designed for this particular work. Figure below shows a circuit in actual use. How circuit works. The IC1 needs to used a voltage only 3 volts. However, for convenience to using with a voltage relays up to 12 [..]

Battery Status Monitor by ICM7555

Published on 2012-08-12 01:51:38

The low power LED flasher by ICM7555 Normally, when you need to use LED display status of the battery 6V-12V. Just add a resistor in series only. It is easy and saving. But not cool and consumes more power. - The impression of a bright that continuously. I think that did not noticeable it. - When the LED light as well So consumes too much energy. Although the LED need voltage is 1.8V only, but it uses too current is 15mA-20mA. A wise choice. - The LED flashes very prominent. - Find out how to us [..]

Small surge protector using delay system by C1815

Published on 2012-08-11 02:31:42

Power failure, voltage drop, power surge, but do not worry when has this circuit. Sometimes when raining and may be windy, until a power failure and the power lower or a flashing lights switch in a short period. And causes the power surges severe. until may cause the electrical, such as TV, refrigerator, computer or other damage. Which is normally protected by the appliance is turned off. But maybe the power failure period, In a different time, Cause you to lose time to stand to turn on – [..]

The OTL amplifier listen comfortably by TDA2030 and TIP41+TIP42

Published on 2012-08-09 08:12:29

Relatively easy to build up to 30 watt OTL amplifier is packed into this project. If you like to listen to music a comfortably ears. Want to create a your power amplifier projects with yourself. This project will direct your heart for sure. By the power dissipation of 20 watts at 8 ohm or 30 watts at load 4 ohm. And easily without any adjustments and Cheap because We use the three tiger army.. Read more …. The working principle. As shown figure the circuit, you know 3 soldier that from one [..]

High current 12V 30A,25A,20A,15A ham radio power supply

Published on 2012-08-04 02:40:06

Essential for those who want to use the radio transmitters from a car to use in your home is you need a ham radio power supply DC-12V or DC-13.8V with enough power out of 5A to 30A. According to size of the a transmitter. I highly recommend this high-current power supply circuit. Because good performance, size of output 13V-14V depending on the load. And can be choose to create multiple sizes of 5A, 10A, 15A, 20A, 25A, 30A. According to actual usage. So allows to save and easier to build. Of cou [..]

Non contact ac detector voltage tester using CD4060

Published on 2012-07-29 21:58:04

Tools that features equivalent of a professional, easy to use, cheaper, and more importantly, safe for use. For checking to find AC 220 Volt or 120V or call that AC main power in various points have or not? Most use a screwdriver to check the electricity. It is a lightweight, easy to carry. But the users lack of knowledge or caution in use. It can be a danger easily of electric shock. Because usage of a screwdriver. The small amounts of electricity to flow through the conductor and users as well [..]

Power Amplifier OTL 100W by transistor MJ15003+MJ15004 (with PCB)

Published on 2012-07-27 02:13:06

If you are looking for a 100-watt amplifier, For the job a small PA system, The news spread in the village or the sound system for the conference. I recommend this circuit, Because sound is very loud. When compared to other circuits at power are equal and very durable. because As Amp OTL do not eat your very expensive speakers certainly. But the speaker may sound a little annoying in the only turn it on. In addition, also use parts number little , easily constructed, without any adjustment. and [..]

The first POWER MOSFET circuit using K134+J49 or IRFP240 + IRFP9240

Published on 2012-07-25 12:47:33

This has been the first Mosfet power amplifier of me, It is the most complete circuit. As a 60 watt power amplifier, this is sufficient for normal use in my home. The circuit may be outdated. It has several advantages. Try read Then you will like it. The most important is the durability of the amplifier, and it directly. You do not want it to work halfway down. Because lose certainly stereo. The power mosfet is the answer to the above problems. The two main features. 1. No problem with the Therm [..]

Loud ringer for phone using KA2411

Published on 2012-07-22 05:13:27

This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. This circuit is easily to build, because it uses a single IC as shown in figure below. How this circuit works The called signal from the telephone lines is entered through C1, R1 Come to the bridge diode circuit D1-D4, D5 is the positive voltage at 20V supply [..]

Best 12V battery charger circuit using LM311

Published on 2012-07-20 11:19:50

The best 12 Volt battery charger circuit our this is a charger circuit automatic system, then when the battery voltage is lower than specified, this circuit provides power to the battery immediately and stops charging when the battery is fully only. So ideal for use in emergency power supply or battery backup power system at all type. And certainly, if you apply to your car battery, it does not have any rules. And the most important is the price that was really very. we will quickly build is ava [..]

Key code lock switch circuit

Published on 2012-07-17 17:51:31

This key code switch circuit is a type of electronic circuit that is created to replace conventional normal key switch. Without inserts a keys. But you can press the number code instead of unlock keys. We do not have to carry a load key and do not worry about your keys are lost. We just must remember to commit to a code only. Feature of this circuit - For in this circuit uses a four numeric code number and this code number can be changed up to one thousand numbers. - The case with other people t [..]

The cheap digital voltmeter using CA3162 and CA3161

Published on 2012-07-11 00:27:02

This digital voltmeter circuit is a saving, easy to use Because it is smaller than a typical circuit, I believe that, after I presented this circuit. You will certainly like it. This circuit can be used as Versatile. Features of the circuit : - 3-digit numeric display with LED 7 segment. - The maximum display +999 mV and the maximum negative-99mV. - Adjustment measurement range is not limited by the resistance, only two options. - Using the voltage + 5 V single power supply is not necessary to u [..]

Adjustable Power Supply 1.2 – 30V 5A using LM338

Published on 2012-07-09 02:00:40

If you want to a variable dc voltage power supply circuit during 1.2V to 30Vdc and can provide a current maximum to 5A. We may be have the many ways such as: to be modified the LM317 Variable Regulator 0-30V 1A by add the power transistor MJ2955 in circuit following Power supply regulator 1.2V-20V and 3V-6V-9V-12V 3Amp or will build the Variable dc regulator 0-30V 5A circuit to be well as well, But these methods. Rather cumbersome and wasting too money. However we can build this circuit easily a [..]

Sine wave oscillator low frequency-constant amplitude

Published on 2012-07-07 11:24:40

In the Sine wave oscillator circuit often to be use the thermistor and Incandescent lamp, for upset the output of circuit has fixed value, the resistance of the thermistor dependent on temperature and as a result to voltage drop across of it. From the slow response of the thermistor make to properties of temperature against resistance is not linear like with that do not distortion value in this oscillator circuit. In this circuit, we use a zener diode in performs this function instead by is used [..]

The variable high voltage power supply 0-300V

Published on 2012-07-06 15:08:44

Here is the variable high voltage dc power supply circuit, which we can customize the output voltage from 0 to 311Vdc, and it is protected the current over limit that we define at about 100 mA. In the circuit you can see the T1 is a mains transformer with a ratio of 1:1, for security reasons , and reduces noise signal as well. Then the mains voltage from the T1 is rectified to DCvolt with bridge diode D1-D4, We use a No. 1N4007 that withstand voltage as 1,000V at the current 1A and and this DCV [..]

The 0-100 microammeter from 0-1 milliammeter

Published on 2012-07-04 23:42:44

Assume that, you wanted to measure a current for about a few micro-amp. what do you do? In when you have an ammeter scale 1 mA only. If you will bring it for measure directly, it can not read correctly, because the meter needle will be wiggle a little. You take a look this circuit before to be simple amplifier Using 2N3904 transistor(or BC337 or 2N2222 or BC148) is only one. When a current flows into pin base, will have a lot of current to the collector pin, we can easily read the current lower. [..]

The most DC to DC converter step up voltage by LT1073

Published on 2012-07-01 10:22:43

Suppose, you want to use the 5Vdc power supply levels up to 100mA, But there is only one single AA 1.5V battery. This working we need to use The DC to DC converter step up voltage. but will choose which is better circuit well, to create simple and small. I try to was looking on [...]

FM wireless transmitter circuit

Published on 2012-06-29 23:47:26

This the fm wireless transmitter circuit, the truth is one kind microphone that developed to be used without a cable from the microphone to the amplifier. Makes flexible to use than a plain microphone much Because without cumbersome cables. And also save a microphone cable as much Because microphone cable is high quality that has [...]

The speaker protection circuit

Published on 2012-06-28 06:32:59

Why to have The speaker protection circuit? How do the speaker protection circuit can prevent the speakers? This may be questions understand of somebody, and if you have not yet received a satisfactory answer, here is the answer. For the power amplifier circuit in the new version, usually popular to build by the direct coupling [...]

Small FM radio receiver

Published on 2012-06-21 21:24:08

This circuit is FM radio receiver that very small size and works well, although the sensitivity is poor. The principle of this circuit is to use the generator frequency circuit. Which consists of Q2 and Q3, they work by producing a frequency sync with the frequency has been derived. By the Q1 which acts as [...]

The professional solid state relay

Published on 2012-06-20 18:41:02

A solid state relay circuit that in common use design to be controlled by the input voltage from 3V to 24V. However, in actual usage. We found that at low input voltage. Performance of the circuit is decreased. Because the most input circuits will be using the resistor to control the current flows through the [...]

Simple Signal injector by transistor

Published on 2012-06-17 11:20:17

One of my friends is an electronic technician amateur in repairing of television or radio receivers. He said he is made a signal injector circuit to detect the signal in various sectors. For example: in the sector amplifier, when the input signal of this circuit, if the amplifier is good, we can hear the sound [...]

The old many mobile phone or cell phone circuits

Published on 2012-06-16 19:23:58

One of my friend has the repair mobile phone shop in rural areas. He said he lived in a small village, the people has low income. But almost every house will be used cell phone because It is easy for us. However mostly used in older models Or the second hand, For economy. And he [...]

Simple Active antenna in SW/MW/FM bands

Published on 2012-06-11 07:29:20

This is a simple active antenna circuit, for the radio receiver SW/MW/FM band. It is a circuit to try to work on many brands of radios. This circuit has a only 18-inch antenna, when used with short wave The radio receiver will be able to receive signals from stations around the world more clearly. In [...]

Best digital pocket multimeter

Published on 2012-06-10 02:20:16

The old digital multimeters of my friend loses, because It aged about 10 years, the LCD screen is dead. He has a good idea to buy a new multimeter that is small size, the normal function fully : to measure the DC voltage,AC voltage, The current DC, AC and measure the resistance and Solid In [...]

Fuse status indicators for power supply 12V

Published on 2012-06-07 17:54:41

This circuit is a Fuse status indicators for power supply 12V. If a fuse is normally, the LED is going to lights all the time. But when it lacks, the LED will be blinking. The value of this equipment in the circuit is suitable for a 12 volt power supply. However able to change the [...]

Buffer circuits for digital cmos

Published on 2012-06-03 15:06:42

The family of CMOS digital ICs have many strengths. It can be used to power a 3-16V, Easy and cheap. It has the same frequency is not high. Slow response that IC – TTL applications are easy to use and cheap. Slow response to IC – TTL applications. The problem that I found as the [...]

Telephone repeater circuits

Published on 2012-06-03 08:13:11

The telephone repeater or The call signal peripheral circuit to the loud than the original. It’s a circuit that we design follow the request. One of my friends. His ears are a bit tight as such phone rings only. He does not quite go ahead. Therefore, it is my responsibility, To help design. For the [...]

Oscillator generator twin frequencies circuit

Published on 2012-06-03 03:29:32

Usually we used the IC – NE567 is only tone decoder circuit. But friends believe or not. We bring it to a frequency generator circuits as well. The band has two levels 1.6Khz and 4kHz. This defines frequency of the Resistors and the Capacitors, or calculated from 1.1 / RC, The R is normally set [...]

Automatic light dimmer circuit

Published on 2012-06-02 10:34:10

This is an automatic light dimmer circuit. You do not need to dim the lights by yourself. It is so very convenient, because we use the LDR to detect external light. To control the Triac, and the brightness of the lamp next. Suppose low light so there is voltage across the LDR many making the [...]

16 key encoder using IC 74C922N

Published on 2012-06-01 07:26:04

In the design of the BCD signal circuit that defined by pressing a key is difficult for a electronics beginner so much. With this circuit so be the simple answer that can be used as versatile, because circuit is designed using a single IC follow the circuit shown in Figure 1. Key input circuit connected [...]

Small three step level indicator

Published on 2012-05-28 12:32:37

Today we look at the concept of a level indicator circuit which was built to be very small, can be displayed with LED 3 step. When see in the circuit is very simple. We use a variable resistor(Potentiometer) with 3 unit only, making this the circuit cheap and easy. The Resistor values of Potentiometer VR1-3 [...]

The good electronics how?

Published on 2012-05-25 03:49:07

We use electronic devices. But most of us do not really know what goes on. Once inside it. But the understand some basics about electricity and electronics. Can be worthwhile for three reasons: 1. Learning how the technology works, you will become can control world, instead of being controlled by it. 2. Learning about electronics [...]

Band rejection filter using TL071

Published on 2012-05-15 14:47:01

The band rejection filter circuit is not wide filter that can denial the frequency up to 60dB by we used the TL071 single chip op-amp it is very low distortion and work good at output to maximum to 100kHz or the range 1Hz to 20kHz In the circuit we defined three resistors R1,R2,R3 are like [...]

Precision half wave rectifier using op-amp

Published on 2012-05-09 23:19:38

This circuit provides for right half wave rectification of the input signal. The op-amp IC no-NE5535 is Dual High Slew Rate Op-Amp, it is used for main of this circuit. The input signal have two-phase supply are Fist, positive signals is the gain is 0; And second, negative signals is the gain is – 1. [...]

50 ohm driver circuit

Published on 2012-04-30 01:52:51

When you are connected to buffer a tester to outside tool, we should have an booster with enough bandwidth and power disposition ability. This circuit is a very simple for unity gain buffer; it is only two pairs of emitter followers. The base emitter voltages of Q1 and Q2 cancel out, and so do those [...]

Visual zero beat indicator

Published on 2012-04-29 03:48:04

This circuit is suitable for an indicator to audio signal lower than 3Vp-p. In the circuit, we use a very small parts with only two of the LED display and built-up resistor for current depression. Light-emitting diodes(LED) connected with reverse polarity provide a visual indication of zero-beat frequency. Each Led is on for only half [...]

Purpose power supply using LM723

Published on 2012-04-16 10:27:10

General Purpose Power Supply by L146 or IC 723 This power supply is designed for general purpose use. Advantages of the circuit are first the voltage can be adjusted from 0V to greater and second it does not require a double sided secondary winding transformer. For high voltage outputs you can use L146 or alternatively [...]

High Q notch filter

Published on 2012-04-10 20:59:07

In the circuit shown, Twin-T network connections with LM102 in form of High Q notch filter. Usually, the junction of R3 and C3 to ground, is bootstrapped to the output of the follower. Because it has a very low impedance,neither the depth nor the frequency of the notch change. However, Q increases in proportion to [...]

Precision Peak voltage detector with a long memory time.

Published on 2012-04-04 00:18:49

If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor that is accurate. So It [...]

Background music decoder

Published on 2012-03-31 05:35:53

This is a background music (SCA) decoder circuit from the input demodulated (multiplex) FM signal. We use NE565 (Phase Locked Loop IC) to be base of this circuit, for easy and cheap. A resistive voltage divider is used to set a bias for the input (pins 2 and 3). The input passes through a two-stage [...]

Crystal oscillator using TTL

Published on 2012-03-30 05:25:27

This are simple and cheap crystal oscillator circuit, that we use a few parts comprises a TTL digital number SN7404 (Package contains six inverters), four resistors and a crystal. The tree inverters gate are biased into their linear regions by R1 to R4, and the crystal provides the feedback. Oscillation can only occur at the [...]

Precision current sink circuit

Published on 2012-03-29 00:51:33

This is a current sink circuit that uses a transistor, Jfet and LM101 IC op-amp, so there are high precision. The 2N5457 Jfet and PN2222 bipolar have normally high output impedance. The R1 is used as a current sensing resistor, for provide feedback to the LM101 op-amp that it supply a large amount of loop [...]

5V to isolated 5V at 20mA converter by MAX635

Published on 2012-03-28 08:13:55

When we need a constant voltage 5V at the current about 20mA, by there are power supply source voltage about 4V to 6V. In this circuit, We use the MAX635 IC number is the main equipment, that acts as Preset/Adjustable Output CMOS Inverting Switching Regulators. At pin A, a negative output dc-dc converter generates a [...]

12V Battery charger using UJT

Published on 2012-03-21 11:49:09

This is an automatic 12V battery charger circuit, they uses the power SCR and UJT are main parts. And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not [...]

Dual limit comparator with LM709

Published on 2012-03-07 01:25:40

This voltage comparator circuit gives a positive output when the input voltage is a positive or negative more than 8.5V. But in between that the output is negative voltage. The positive limit point is defined by the ratio of R1, R2, and the negative point by R1, R3. The forward voltage drop across the diodes [...]

Musical chime generator with ua741 oscillator

Published on 2012-03-03 12:13:17

This is a musical generator that uses bandpass filter circuit with ua741 op-amp as act converts a sound signal in multiple feedback patterns. When connected the voltage input from a rhythm generator with a short pulse , makes it ring in natural resonance frequency. As the output oscillations vanish suddenly and resemble percussion or strum [...]

Single transistor phase shifter

Published on 2012-03-02 05:48:57

This is a basic NPN transistor circuit which it provides a simple mean of obtaining phase shifts between zero and 170 degree. The BC108 transistor works as a phase splitter, the output at point A being 180 degree without phase from the input. Then Point B is in phase with the input phase. Adjusting R1 [...]

Power line frequency meter

Published on 2012-03-01 04:22:06

This is the meter show the frequency of a power generator, which it has voltage 110V-240V at 10-100HZ. The output sine waves are converted to square waves by the 100k 2 watt resistor and the 6.8V 1watt (1N3829A) zener diode. Then the square wave is transformed by the 0.22uF capacitor and the current is averaged [...]

Wien bridge oscillator with FET

Published on 2012-02-27 10:32:20

Wien bridge oscillator is sine wave oscillator. It can generate a big of frequencies. The oscillator has based on a bridge circuit, which compose four resistors and two capacitors. The oscillator can also be viewed as a positive gain amplifier combined with a band pass filter that provides positive feedback. The field effect transistor (FET) [...]

Easy in-line rf wattmeter circuit

Published on 2012-02-09 10:29:52

This is a little ideas of Easy In-line RF wattmeter circuit, it is insensitive to frequency, so calibration will be correct better than a wide frequency spectrum. For example the whole amateur HF spectrum; If the values of L2, the voltage divider at capacitors C1 and C2, and the resistances of R1 and R2 are [...]

The Safe constant current source.

Published on 2012-02-07 01:32:02

Figure the top is a Safe constant-current source circuit, how it works? A cmos op-amp (number ICL 7611) controls the input current through a P-channel Hexfet power transistor (No. IRF 9520), then to keep up a constant voltage across the R1. As they are connected in a serial form, so use the together current by: [...]

The universal battery charger using Lm317

Published on 2012-02-04 04:51:09

Here comes very simple idea is the universal battery charger circuit. When, an input power is applied to the circuit. The SCR1 (Silicon controlled rectifier) turn off, then not has a bias current path to ground. The LM317 acts as a current regulator, It is connected to the battery thought a one way diode D1, [...]

simple nonlinear low pass filter

Published on 2012-01-23 00:54:06

This simple circuit is nonlinear passive on low pass frequency filter. It ‘s small size and easy to made for do not used the external power supply, but refuse a lot of noise ripples and need to a input voltage is stable. The circuit works best, when the signal level is importantly higher than the [...]

Light meter by LM334

Published on 2012-01-16 07:58:15

The light meter is a tool, measure the quantity of light, widely used to a photography, To decide the correctness of the exposure. Sometimes, we are use with other works, such as my son likes to use in science experiments, which do not need to have high quality. This simple light meter in figure 1 [...]

IRF540 MOSFET N-CH 100V 33A TO-220AB

Published on 2011-12-25 07:54:55

Specifically designed for Automotive applications, this HEXFET® Power MOSFET utilizes the latest processing techniques to achieve extremely low on-resistance per silicon area. • VDSS = 100V • RDS(on) = 26.5mOhm • ID = 36A. Read more

Alpha Potentiometer 25K Linear

Published on 2011-12-25 07:51:07

Guitar Amp Potentiometer. Audio/Log pots are typically used for volume control, and Linear pots are typically used for effects. 25KL / 25K Linear / 25KB / 25,000 ohms. Fits 3/8″ Hole. 1/4″ Solid Shaft. 24mm Body, Solder Lugs, 1/2 Watt Rated, 300° Rotation, 250VDC Rated, Carbon Composition. Comes With Hex Nut and x2 Washers Read [...]

microtivity 5mm Assorted Clear LED

Published on 2011-12-25 07:44:49

Contains 10 Clear Reds, 10 Clear Yellows, 10 Clear Greens, 10 Clear Blues, 10 Clear Whites and 10 Clear Pinks. These light-emitting diodes work well for a wide variety of applications including Arduino projects. Comes with some resistors for connection. Forward Voltages are Clear Red and Clear Yellow 1.9-2.0V, Clear Green: 2.9-3.1V, Clear Blue, Clear [...]

Chocolate style keyboard

Published on 2011-11-28 23:03:12

Now I have a problem keyboard of my laptop,very hot. My friend Tom said, I should to change was a external keyboard,wireless stye is so well. I loved a laptop keyboard,it is chocolate style softly and slim. But found difficultly and expensive,too. I saw on www.amazon.com,the one keyboard was very interesting,comfortably compact,tight workspace,saving size, etc. [...]

The resistors kit 86Value 860 Pcs.

Published on 2011-11-14 00:22:12

Read more When we made the electronic projects. The resistors was important component because we use more value and too much code. We must had a lot of resistors in store. But where to be buy they. Follow to I search in internet,founded The Joe Knows Electronics 86 Value 860 Pc. Resistor Kit ,good produce [...]

Mini roulette system

Published on 2011-07-05 10:56:36

A mini roulette circuit, When the switch S1 the output at pin 1 of the IC1a the voltage is “high”,The oscillator circuit output IC2b, IC2c work.Clock pulse generator fed to IC3, a voltage “high” output to the output pins 3, 11

Digital 9500 Finger Pulse Oximeter

Published on 2011-07-03 23:20:52

The Original All-in-One Digital Fingertip Pulse OximeterTM Pulse Oximetry at Your Fingertips, Anywhere, Anytime NONIN revolutionized pulse oximetry with the Onyx. Hundreds of thousands of people trust Onyx, the first self-contained digital fingertip

Synthesized FM Stereo Transmitter Kit

Published on 2011-07-03 23:07:15

Need professional quality features but can’t justify the cost of a commercial FM exciter? The FM25B is the answer! A cut above the rest, the FM25B features a PIC microprocessor for easy frequency programming without the need for look-up tables

Rotary electronic switch

Published on 2011-07-03 19:25:13

Rotary switches electronic circuits, using a single switch choose a function of external control circuit has 9 positions.Work was, when the switch S1, the output signal from pin 2 of IC1, a “high” at all, and the pulse signal to IC2, the

Factory Assembled AR2L

Published on 2011-07-03 00:31:34

Because many small airports do not have any control personnel on duty, especially at night, it is necessary to either have the runway lights activated at all times to allow planes to land or have some method of allowing a pilot to turn on the lightin

Audio/RF DDS Signal Generator

Published on 2011-07-03 00:07:35

Announcing our NEW SG560 Signal Generator! We increased the frequency range all the way up to 5MHz and all the way down to 0Hz (yes, we mean zero…or DC!) continuously in 0.1Hz steps across the entire range! Next we increased the output level to

Flashing brake lights

Published on 2011-07-02 20:04:10

This circuit will allow the brake light was flashing.The default behavior. When the power supply to the circuit, Or tap the brake it.The IC timer IC2 drive current to transistor Q2 and producing oscillator output, pulse signal output at pin 3 to inpu

Davis Wireless Weather Envoy

Published on 2011-07-02 01:42:08

Wireless Weather Envoy™Receive data from a wireless Vantage Pro2 integrated sensor suite or wireless Temperature Temperature/Humidity or Leaf Wetness & Soil Moisture/Temperature stations and post it to your computer without a console! When use

2ch Recorder Isolated 12/24VDC Power Input And USB

Published on 2011-07-02 01:21:42

The DataChart 1250 is a powerful, compact digital recorder with intuitive operation, flexible input configuration and large memory capability. Combining small package size with extreme flexibility make the DataChart 1250 a powerful, yet economical, d

Buy HandHeld Spectrum Analyzer

Published on 2011-06-28 21:38:05

Built-in calibrated measurement microphone 1/3 octave real-time analyzer 31-band EQ setting value display (boost/cut) RT60 reverb time measurement Phase checker Noise generator with pink noise, 1kHz and polarity test signal, balanced output Memory an

Delay switch turn on the monitor

Published on 2011-06-28 07:21:26

This is a time delay switch on the monitor. The contacts of the relay acts as a switch.The contacts of the relay, acting as a switch.When entering into the 220volt mains. Circuit delay for a while. To reduce current surges, gradually flowing into it,

Bench Dog Tools Cast Iron Router Table Extension

Published on 2011-06-26 19:39:48

Expand your table saw’s versatility by adding this industrial grade router table in place of the extension wing. Perfect for shops where space is tight, ProMAX includes a cast-iron top, Bench Dog’s 28″ ProFence, a miter gauge track

Hayward Goldline Controls Aqua Logic Main PCB Board

Published on 2011-06-26 19:16:48

GLX-PCB-MAIN AQL-PCB-MAIN Main PCB, AquaLogic All Versions All Date Codes Goldline Controls, Inc., began as Independent Energy, Inc., a company founded in 1975 by two engineers who graduated from Brown University. Independent Energy initially focused

Wide band high frequency amplifier

Published on 2011-06-25 06:10:03

High-frequency amplifier circuit,Wide frequency band between 75-150 MHz,Using transistors, a PNP amplifier.To enhance the signal strength.Before the receiver of the phone. Or FM radio or amateur radio. If high-frequency signals, in particular, its VH

Buy Hybrid headphone amplifier

Published on 2011-06-25 02:08:36

The Little Country III paints a accurate musical reproduction regardless of the source. It features a rich, beautifully detailed sound from top to bottom and a superb soundstage. You’ll find yourself lost in the music – almost hypnotic li

RF EMF Strength Meter

Published on 2011-06-25 02:02:09

This RF EMF Strength Meter monitors high frequency radiation in the 50MHz to 3.5GHz range. Ideal for mobile phones, cell phones, base stations, locating RF hotspots, wireless network (Wi-Fi) RF detection, RF”Electrosmog” detection, and mi

PIR. motion sensor alarm circuit

Published on 2011-06-24 00:40:06

A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit, Q1 and relay it to work and hold for about 20 seconds. to apply to the siren to signal a warning

Zen Toolworks CNC Carving Machine DIY Kit

Published on 2011-06-24 00:03:23

This is just the CNC machine with motors. You will need a 3 Axis Stepper Motor Driver to manage each motor, a spindle/cutter(a Dremel would work) and a DC power supply for the driver. You will also need a computer with a standard printer port and CNC

QM1000 Automatic Pick and Place Stand-Alone Machine

Published on 2011-06-23 23:52:41

Patent-pending technology applied in automatic picking up. 2000 estimated pph(parts per hour). Placement of 0402 standard (upgrade for smaller parts). Computer vision automatic centering system for IC’s (SOP, QFP, BGA) and better placement of s

Xytronic 426DLX Fume Extractor

Published on 2011-06-23 23:05:44

The Xytronic 426DLX incorporates a built in high efficiency, low noise, brushless mini fan. Easy to replace activated carbon filter effectively absorbs noxious flux and lead fumes. Quickly removes smoke and fumes….. Read more

Small stereo amplifier for computer with TDA7025

Published on 2011-06-23 05:30:41

Small stereo amplifier,low power, less devices, IC TDA7025 is the main equipment. Operation of the circuit, the signal split into left and right through the capacitor coupling of C1, C2 is a variable resistor VR1 adjusts the strength of the input sig

BK Precision DC Electronic Load Programmable

Published on 2011-06-22 22:59:48

Affordable and full-featured with a high degree of accuracy and great display resolution. Ideal for DC power supply and DC-DC converter testing and calibration. Fully programmable via the RS-232 or optional USB interface, making it a great companion

DC Power Supply Regulated Digital Display 0-60 volts 0-12 amps

Published on 2011-06-22 22:30:26

These CE certified Regulated DC power supply units comply with Power Supply Harmonics Current Regulations IEC1000-3-2, and a power factor of 95% (typical) is cleared. These models feature high reliability and various types of protection, and can be u

Measure the distance by bicycle

Published on 2011-06-21 06:16:14

Operation of the circuit. Wreath switch S1 to detect the magnetic field. By S1 on the circuit.When a magnetic force drew near.When the magnetic field out away.It works in conjunction with resistors R1, R2 and capacitor C1.Pulse generator signal to IC

Mini switches controlled by light

Published on 2011-06-20 07:23:10

Mini switch control circuits with light, by used the photo transistor is a light sensor, and Schmitt Trigger output drive current, Out a load or an external circuit,can supply up to 25 milliamps. This circuit uses less equipment. Can be used for smal

Door buzzer sound with CD4001 CD4060

Published on 2011-06-18 09:07:39

The Door buzzer sound circuit was two-tone sound. With the switch S1. working of circuit,The IC1 is a frequency dividing circuit, and generator a sound frequency came out.by the C1, R1 are the frequency generator. This audio signal from pin 7 and pin

over load protection for a transformer

Published on 2011-06-17 06:23:33

The working principle of the circuit. Start step, dc voltage power from the secondary coil of the transformer will be charged to C1. through D1.When the switch S1 to the circuit, current flows through relay contact at the NC,And flowing through the l

DC motor controller diagram with SCR and cmos ic

Published on 2011-06-16 08:08:36

This is speed controller circuit of 12Volt DC motor.You can adjust the speed of rotation of the spindle motor from 5-60 cycles per minute. The work of circuit, The IC1 is nand gate ic type,It accepts the voltage from the bridge diode BD1. But there i

Internal Resistance Tester For Batteries

Published on 2011-06-09 01:46:22

This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digi

Doorbell for the Deaf

Published on 2011-06-07 06:18:14

This circuit provides a delayed visual indication when a door bell switch is pressed. In addition, a DPDT switch can be moved from within the house which will light a lamp in the door bell switch. The lamp can illuminate the words “Please Wait&

Magic Wand Conjuring Trick

Published on 2011-06-07 06:13:05

The simple conjuring trick in Figure 1 is intended to provide some enjoyment for the beginner in electronics or conjuring, and should take only an hour or two to build. The trick works as follows: a wand (with a magnet mounted in one end) must pass i

First time electronic learning with Snap Circuits SC-300

Published on 2011-06-06 05:59:59

Now my son, age 5 years.I want to find a good event for him in free time. Future he would be happy to create electronic projects. So I find information about Beginner electronic learning. On www.amazon.com site There are many interesting machines. Th

Getting Started in Electronics

Published on 2011-06-05 22:22:16

This is a complete electronics course in 128 pages! Author Forrest Mims teaches you the basics, takes you on a tour of analog and digital components, explains how they work, and shows you how they are combines for various applications. Includes circu

Light-Controlled Pond Pump

Published on 2011-06-05 00:22:03

This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mean that we don’t have to get cold and wet when turning the pump on or off manually but it’s a

SE Digital battery tester 12V

Published on 2011-06-03 08:46:58

Easy-to-use, compact and accurate – pays for itself by reducing harmful battery waste*Works with virtually all replaceable battery types; alkaline, lithium, button, 1.5V – 12V*Fits battery sizes AAA – D, 12V, 9V, camera, watch &

Wireless IR-RF Remote Repeater Kit

Published on 2011-06-03 01:57:25

Have you ever been frustrated with the range of your remote controls? Tired of having to bounce your IR remote off ceilings and walls? Do you want to run your system from another room or floor? This is the answer to your prayers! Extend the range of

The Clapper Sound Activated On-Off Switch

Published on 2011-06-02 23:04:02

The sound activated on/off switch. With clap detection lights. 2 Claps turn on the lamp. 3 Claps turn on the TV. The Clapper can control one or two appliances at the same time. Set the dial to Home or Away. Connect your appliance(s) into The Clapper.

Simple dc motor speed controller using quad NOR gate

Published on 2011-06-01 05:33:35

Here a quad NOR gate (IC1-CD4001) acts as a 50Hz astable multivibrator that generates a rectangular output. The mark-space ratio of the rectangular waveform is fully variable from 20:1 to 1:20 via potentiometer VR1. The output from the multivibrator

Basic 12v Motor Speed Controllers using 2N3055

Published on 2011-06-01 05:22:55

Here are two simple 12V DC motor speed controllers that can be built for just a few dollars. They exploit the fact that the rotational speed of a DC motor is directly proportional to the mean value of its supply voltage. The first circuit shows how v

Discrete PWM Generator Circuit

Published on 2011-05-30 06:16:50

PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjustable analogue voltage level (in the case of a NE555 based PWM generator) or digitally using binar

DC Motor Speed Controller

Published on 2011-05-30 06:00:00

This circuit takes advantage of the voltage drop across bridge rectifier diodes to produce a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as efficient as a switch-mode circuit but it has the virtues of simplicity

Pump Controller For Solar Hot Water System

Published on 2011-05-28 20:24:02

This circuit optimises the operation of a solar hot water system. When the water in the solar collector is hotter than the storage tank, the pump runs. The circuit comprises two LM335Z temperature sensors, a comparator and Mosfet. Sensor 1 connects t

Junk-box Fan Speed Controller using lm335

Published on 2011-05-28 20:05:24

My new home theatre receiver was getting rather hot in the close confines of its cabinet, with the temperature reaching over 40°C after only about 30 minutes of use. To help lower the temperature, I decided to install a fan in the cabinet. A 75mm ho

12V Speed Controller and Halogen lamps Dimmer

Published on 2011-05-26 05:20:10

This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulat

Long-Interval Pulse Generator using LM3710 supervisor IC

Published on 2011-05-26 04:59:42

A rectangular-wave pulse generator with an extremely long period can be built using only two components: a National Semiconductor LM3710 supervisor IC and a 100-nF capacitor to eliminate noise spikes. This circuit utilises the watchdog and reset time

1kH Synthetic Inductor using TL082

Published on 2011-05-26 04:46:57

Inductors can be mimicked quite easily using operational amplifiers. The circuit shown here was developed to have an inductance of 1000 H (say, one thousand Henry) with good damping. Using this design you can build a resonant circuit with a center fr

ultrasonic dog whistle circuit

Published on 2011-05-25 06:34:28

It’s well known that many animals are particularly sensitive to high-frequency sounds that humans can’t hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. My ai

automatic battery charger circuit

Published on 2011-05-25 06:15:59

The following automatic battery-charger design is created with a circuit that could qualify as the simplest window comparator ever built around a single transistor. It starts charging when the battery voltage drops beyond a preset value, and it stops

Transcutaneous Electrical Nerve Stimulator

Published on 2011-05-24 02:43:48

A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he u

Behringer 48V Phantom Power Supply

Published on 2011-05-24 01:07:24

Portable Power The PS400 features XLR THRU jacks and provides superb noise-free operation. Just connect your condenser mic to the MIC INPUT and send a line from the MIC THRU to your mixer. You can toggle between +12 V and +48 V power for maximum flex

AM/FM Preamp Kit

Published on 2011-05-23 06:48:15

Amplify Those Signals! Designed specifically for AM/FM radio reception, the K2622 provides 22dB gain between 10MHz and 150MHz. The sleek metal housing provides the necessary shielding and assures you of the least amount of interference. Input power i

IR 2 Channel Remote Receiver Kit

Published on 2011-05-23 06:28:09

Program Two Functions! Use the sleek K8049 as the main remote for your IR control. Perhaps add an automatic light dimmer with the K6712 above. But with 15 channels available on your remote youve got lots of control room to spare! This tiny little rec

Tablet Reminder Uses Watch Module

Published on 2011-05-23 02:36:32

This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gates (IC1a & IC1b) wired as an RS flipflop. The watch is set to “tablet time̶

123 Game – All MCU-free (simple electronic game circuits)

Published on 2011-05-23 02:25:15

This electronic game pits a human player against the ‘machine’. The opponents use a common ‘game token’ and take turns moving along a path by one, two or three steps, and the winner is the first one to reach the goal exactly. Incredibly enoug

RGB To Color Difference Converter

Published on 2011-05-23 02:11:56

The circuit diagram shows two LT1398’s from Linear Technology used to create buffered color-difference signals from RGB (red-green-blue) inputs. In this application, the R input arrives via 75? coax. It is routed to the non-inverting input of ampli

Grand Prix Starting Lights using LM339

Published on 2011-05-22 08:57:01

This circuit reproduces the starting light sequence currently used by FISA for Formula One racing. It could be used with slot car sets (such as HO scale AFX/Life Like/Tyco sets) or radio controlled cars. IC1, a 555 timer IC, is used as a clock pulse

El-Cheapo Fluoro Ballast

Published on 2011-05-21 07:50:29

This simple circuit can start small (15W or less) fluorescent tubes such as those used in PC board exposure and EPROM ultraviolet erasure boxes. As you can see, the tube’s filament heaters are not used. Instead, ignition is provided by a voltage tr

Transistor quality checker with buzzer

Published on 2011-05-21 01:00:52

You checked the transistor by measuring the resistance between the different pins. Sometimes it has problems, such as when measuring the resistance between the various legs correctly. But it does not work in the real circuit. Because while there is n

Telephone ringer light

Published on 2011-05-20 10:26:12

If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. It’s actually a telephone ringer capable of making any mains-powered device work from the ringer of your fixed line. With it, you

Classic TV Pong Game Kit

Published on 2011-05-20 05:34:23

Build the classic pong game that started the video game revolution. Has composite video and audio outputs, adjustable brightness and auto power off. One and two player modes with four difficulty levels. Paddles controlled by buttons on the board. Pre

Bulldog keyless entry system for cars

Published on 2011-05-20 05:09:58

The unit was easy to test and install and has a range of about 100 feet. For basic testing, temporarily connect the power and ground wires and listen to internal relay clicks while pressing lock and unlock buttons on one of the remotes. To get a good

60 seconds Delay Timer Kit

Published on 2011-05-20 02:50:03

The ELK960 Delay Timer is designed to be an economical and flexible solution for any general-purpose timer application. The unit can be configured for use on 12 to 24V systems, with positive or negative trigger logic. Positive triggers can be as low

1HZ Standard digital clock

Published on 2011-05-19 04:11:45

This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the IC-4060 single acting Oscillator and Counter. of the frequency determined by the resistor and ex

Wireless Motion Alert Kit

Published on 2011-05-19 00:46:04

Don’t be caught unaware. Protect your home or business from unexpected visitors. The WMA Wireless Motion Alert system sends an immediate alert when a person or car enters your property. The transmitter operates on one 9V battery, is weatherproo

Interval Timer kit

Published on 2011-05-19 00:24:34

For intermittent operation of circuits and equipment. Blinking light, video/photo single frame shooting, slide projector control, miniature models. Specifications: * Output relay with dry switch-over contact: 3A/24V * Pulse time adjustable: between 0

Electronic Circuits for the Evil Genius 2

Published on 2011-05-19 00:05:34

Teach or learn basic electronics in a hands-on and logical manner by: 1) Getting the book “Electronics Circuits for the Evil Genius 2E” by Dave Cutcher. 2) Getting this new and expanded custom electronic component kit tailored to the 2nd

Temperature-Controlled Soldering Iron

Published on 2011-05-17 04:34:28

One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses t

Coaxial cable tester circuit

Published on 2011-05-16 07:18:36

This is Coaxial cable tester circuit.It is useful to check the cables inside and outside. Check the continuity of the cable, check cable short-circuited. And detection of the high resistance of the cable. Check that all lamp displays with LED. Operat

I want to buy multimeter

Published on 2011-05-16 06:39:36

The generally electronics worker has many tools. Multimeter is a tool that needs a lot, because a project electronics.Require a measure of electricity, such as measuring voltage, resistance measurement, power measurement, and other. I think to find o

Digital Oscilloscope DIY Kit

Published on 2011-05-15 06:59:04

This kit includes everything you need to build your very own, fully functional, digital oscilloscope. Once you’ve got it up and running, the oscilloscope features up to 5M samples/second, 8-bit resolution, up to 50Vpp max input voltage, and mor

Cheap siren with nand gate IC

Published on 2011-05-13 22:52:57

This is a siren sound generator circuit. Which is less expensive and can create simple. The IC1 is using CD4011 (Digital Nand Gate) and the IC2 is CD4046. Operation of the circuit, IC1 is a clock frequency 1 Hz.(Frequency adjusted by the value of R1

The level voltage of logic changer by a JFET

Published on 2011-05-13 08:41:41

This is a logic signal changer circuit,the normal voltage of about 5V. But sometimes we want to 12V or 15V, we can use a JFET.It works by mode COMMON GATE. Simple principle is that when a logic “0″ or 0V.The JFET N-channel type which will

A diode protect cmos circuit

Published on 2011-05-13 04:05:29

The CMOS digital circuit used to produce a osicillator, with pulse low frequency frorm. We use R and C are a lot of period time. it must have a diode to prevent current flow feedback. In picture the oscillator circuit, we use the CD40106 and 74HCT132

Soil dry tester circuit

Published on 2011-05-12 20:08:38

This Check this dry soil circuit For the Blind. Because it will alert on clay. Circuit has less detail. It production the low frequency pulse, the IC CMOS 4001. is primary device,internal structure consists of NOR Gate.When added to RC circuit will b

Neon Flasher Runs From 3V Supply

Published on 2011-05-09 05:38:34

A neon indicator typically requires at least 70V to fire it and normally would not be contemplated in a battery circuit. However, this little switchmode circuit from the Linear Technology website (www.linear-tech.com) steps up the 3V battery supply t

Temperature monitor

Published on 2011-05-08 11:35:11

This temperature monitor circuit is used where a continous analog display of temperature value being monitored is not necessary. A simple indication whether the temperature value exceeded a maximum level or went below the minimum level is sometimes e

Simple Micro Ampere Meter Circuit

Published on 2011-05-08 11:26:46

This simple micro ampere meter circuit can help in measuring small currents in five ranges: from 1 µA to 10 mA. The meter is working in this way: the current being measured Ix shifts the input voltage resulting to an output voltage with an inverted

Increase output current of the op-amp IC LM324 in 85mA size

Published on 2011-05-07 06:29:17

The op amp output current can generally be in the range of 20 to 40mA.However, the LM324 IC number includes op amp 4 and 3 per parallel.Therefore the output currents up to 85mA, it also has significant short-circuit protection too. The properties of

Make and Learning Electronics by Discovery

Published on 2011-05-07 03:41:04

This is Excellent Beginner Book for Hobbyists/Beginners/Makers Book. Want to learn the fundamentals of electronics in a fun, hands-on way? With Make: Electronics, you’ll start working on real projects as soon as you crack open the book. Explore

Electronic Circuits for the Evil Genius

Published on 2011-05-07 03:27:48

Fully updated throughout, this wickedly inventive guide introduces electronic circuits and circuit design, both analog and digital, through a series of projects you’ll complete one simple lesson at a time. The separate lessons build on each oth

Full wave rectifier with an op amp IC

Published on 2011-05-06 10:47:23

This circuit acts rectifier the ACV signal.This circuit usually requires two op-amp, but this circuit uses only one op-amp. The work is easy when a positive input into, The D1, D2 will does not work. The output is equal to R2 / (R2 + R3).When V1 is t

Automatic Light Controller Using 7806

Published on 2011-05-04 10:36:41

Voltage regulator ICs (78xx series) provide a steady output voltage, as against a widely fluctuating input supply, when the common terminal is grounded. Any voltage about zero volt (ground) connected in the common terminal is added to the output volt

Mains Powered White LED Lamp

Published on 2011-05-04 10:10:57

Did it ever occur to you that an array of white LEDs can be used as a small lamp for the living room? If not, read on. LED lamps are available ready-made, look exactly the same as standard halogen lamps and can be fitted in a standard 230-V light fit

Passive Air Band Monitor

Published on 2011-05-04 08:11:53

This broadband radio monitors transmissions over the entire aircraft band of 118-136 MHz. The strongest signal within the pass band of the radio will be heard. The ABM1 has no local oscillator, it doesn’t, can’t, and won’t generate

LED Dimmer PWM DC Lighting Dimmer Controller for LED Incandescent

Published on 2011-05-04 05:27:14

This self-contained 12 volt dimmer and on/off switch is designed for precise control of interior accent lighting in your auto, truck, RV, boat or aircraft. With a 1/4 shaft and easy screw-down terminals, you can install this controller in minutes. It

Attenuate variable radio frequency

Published on 2011-05-03 11:52:54

This circuit can be designed to attenuate signal frequency. Customizable from 1 to 40 dB.If you want to use the band uhf, should be fitted within the frame shield, and C1 to C3 type feeds true.The line should be as short as possible, and the diode sh

Electronic DC Motor Speed Controller Device Modulator 30 Ampere

Published on 2011-05-03 10:55:35

Use the LX066 to control the speed of your electric motor or brightness of a DC light bulb. Obtain low speed from a DC motor without sacrificing torque. The LX066 is a small assembled device with an on-board trim pot to control the pulse width modula

Blinky Eyes Animated Display

Published on 2011-05-03 04:00:36

The ultimate animated LED kit that will dazzle you and delight your friends! Uses a microcontroller to randomly select from many different animations such as a long pause before a wink, or a twinkle of the eye to startle passers-by. … Read more

Automatic Telephone Ringdown

Published on 2011-05-03 03:39:58

What is a telephone ring down, you may ask? They have been used for years as dedicated communications paths between two standard telephone sets. Over a single pair, with a phone at either end, merely going off hook with one phone immediately rings th

9 Volt LED Flashlight kit

Published on 2011-05-02 11:25:09

Ever find yourself fumbling in the dark looking for keys or an item on the nightstand? Well this 9 Volt LED Flashlight by Kikkerland is a tiny treasure that will never leave you in the dark again. The simple yet unique invention combines LED technolo

Simple compressor with 1N914

Published on 2011-05-02 00:25:54

This simple compressor circuit is suitable for use in a recorder tape from the speaker terminals of the receiver.This input can be changed from 200 mV to 6V. The output will remain at close to 5 mV. An attack time of the circuit for about 3 ms and re

Microwave Motion Detector Kit

Published on 2011-05-01 01:06:20

The MD3C sends out a microwave signal and looks for a return. A moving object will reflect back some microwave energy and the kit detects it. Since microwaves (no, you won’t get cooked or burned by them!) are used – heat, light, sound or

Laser Trip Sensor Kit

Published on 2011-04-30 22:22:52

For years hobbyists have been intrigued by the possibility of using a ‘beam of light’ to control other devices! The abundance of inexpensive laser elements that have now become available has further pushed the demand for useful products a

Noise limiter signal

Published on 2011-04-30 08:33:54

Interference from ignition noise pulse of the engine, it can cause various problems associated with radio communication equipment installed in the car.This circuit improves signal to noise ratio (S / N-ratio) was better, To connected between the outp

Simple AGC for radio receiver

Published on 2011-04-30 05:02:54

The automatic Gian control circuit also AGC with audio signal is simplest for compress to signal in the Radio receiver. It is ideal for short wave radio receiver used in areas with weak signals. You should adjust the master volume control dress until

Repair Dell GX620 computer with myself

Published on 2011-04-27 11:08:11

I had been using Dell GX620 Computer for a long time because it has good and durability. I lost it some days ago. My friend who is a computer repairer said the power supply is having problem. He told me to buy it at amazon.com,they are very nice it h

Automatic Plant watering reminder

Published on 2011-04-25 12:23:08

House plants in general often have a pretty hard time of it compared to their garden bound cousins, which seem to get more than their fair share of watering, even if their owner forgets, thanks to the British weather. With so many other things to thi

Double signal with non linear characteristic

Published on 2011-04-22 11:43:23

This is a double frequency circuit, it was uses a non-linear characteristic of the transistor for Regutifier transistor to a half-wave rectifier. The resistor R1 is the feedback control, fine-tune the output waveform is purity.

60 Watt Solar Charging Kit

Published on 2011-04-19 12:02:22

I’m do looking to backup energy for my laptop, The 60 Watt Solar Charging Kit is need for me very much, it low cost but Good quality,saving money very much,…. Read more Example review I can run my laptop all day, as well as recharge the c

Very cheap ac light dimmer

Published on 2011-04-18 11:30:56

You may had saw to a complicated AC light dimmer circuit ago. Now let’s look simple, but useful, fairly good. This circuit uses a capacitor in series with one lamp and accessories with a bit more. Is used to control the light dimmer, Easy and c

Voltage to current using op-amp and power transistor

Published on 2011-04-13 10:00:49

This circuit changes the voltage to current, can provide dc current characteristics and AC so-so Circuit consists of 3 op-amps, 2 transistors is moderate. Passive devices and only a little. This circuit with grounded. load, it controls the rate Vout

Digital Dice circuit

Published on 2011-04-11 10:08:25

A electronic friends was seeking a play circuits in your free time,a cheap and easy to made.This dice digital circuit would be a favorite of everyone, by using it to display the numbers. When you switch to a spin button or it like is tossing a dice.

The transistor lat

Published on 2011-04-10 10:03:57

This circuit, it works similar to a SCR.When the trigger input is high, The transistor Q2 and Q1 will work,therefore a current flow to the base pin of Q2,it has voltage 0.7 volts at resistor R1. When cutting the activation voltage, the transistors ca

High impedene small amplifer circuit

Published on 2011-04-09 12:52:27

This simple circuit was a presented,it can give power output about 1 watt, when connected to a power supply 9 volt. The advantage of this circuit is that it uses a dual darling ton to increase the size as much as of input impedance about 20 Meg ohm.

Easy dry cell charger with CMOS IC 4011

Published on 2011-04-09 09:47:23

The dry cell charger circuit can be fully charged about 12 hours.When used with a 9 volt supply,the equipments in the circuit for the AA type cell.When using the C and D type cell, should reduce the value of the resistance Rx to be 68 ohms.In charge

Alarm sound with control switch.

Published on 2011-04-08 06:49:35

The heart of this circuit is IC No. 555. When the alert sound was working, even though the switch will continue to be the same, the sound still does not stop immediately.But it will stops automatically, when a set time period,Depending on the resista

The best electronic switch

Published on 2011-04-05 12:44:20

This switches circuit,It can be useful many things.which a output of the circuit can be controlled a bell or other sound source circuit or control relay or SCR.(a circuit for RY1,and SCR2 are used with AC voltage source only) The contact switches (S1

Headlight Warning Buzzer

Published on 2011-04-04 10:13:03

Often,we find that a lot of motorist.They have forgotten to turn on light in a car when parking.then back to start the machine,it did not work,because a battery did not have a energy. but this circuit will be warning a car driver for instantly know,w

Automatic watering a tree

Published on 2011-04-02 08:04:20

A trees should be taken care of as well. This circuit allows for watering trees, can be done automatically.When soil moisture levels decrease, to values that are defined.(Which can be determined by the resistance of R1.) A relay RY1 starts.This relay

Simple Cat.5 Network Tester

Published on 2011-03-31 11:52:14

This circuit came from a need for a “quick and dirty” network tester that could be operated by one person. All the commercial units I tried required a person at the other end to check the remote LEDs, as the transmitters could not be made

Easy add value capacitance

Published on 2011-03-29 08:32:23

Some circuit we need to use very high value for the capacitance value of capacitors.For example filter circuit etc. This circuit add capacitance, can use instanced of an difficult which is expensive or very high value. This circuit was analyzed from

Easy Power supply for cassette player

Published on 2011-03-25 20:52:01

This circuit that you see, It is an one style of an easy simple power supply, for a recorder or a cassette player in the car which used voltage 12V.It is only using the current abount 100mA. When it occured over load current at output.it will not dam

Body Charge Detector

Published on 2011-03-24 08:45:05

It is well known that through such simple everyday activities as walking on a carpet or moving in a chair, the body accumulates a static charge – sometimes many thousands of volts. Due to its extreme sensitivity, this circuit will detect not on

Simple Amplifier circuit for converts the analog signal to digital

Published on 2011-03-23 04:45:33

The electrical signals from transducer,Sometimes, it is value less too,For input to the circuit to convert signals from analog to digital.To achieve a satisfactory,We need a power amplifier, who can tell strength of the input signal is simple.This ca

Invisible Broken Wire Detector

Published on 2011-03-22 12:44:28

Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug. Due to prolonged usage, the power cord wires are subjected to mec

Low Supply Rail Detect voltage

Published on 2011-03-22 12:25:56

Here’s a simple low supply rail detection circuit that costs peanuts and takes just 20 minutes or so to make. Its power consumption is quite low, so it could easily be built into battery-powered devices. Instead of using an op amp, the circuit

Video Tracer For Trouble-Shooting

Published on 2011-03-19 04:04:18

This circuit was designed as an aid to installers and maintainers of video systems. It is basically a video sync separator (IC1) followed by a LED and buzzer driver (IC2, Q1 & Q2). In use, the device is connected to a video cable and if there is

NTSC-PAL TV Signal Identifier

Published on 2011-03-19 03:50:37

This circuit is able to identify PAL and NTSC video signals. Its output is high for an NTSC signal and low if the signal is PAL. This output signal can be used, for example, to automatically switch in a colour subcarrier converter or some other devic

Video Amplifier using BC560

Published on 2011-03-19 03:42:13

The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately

On And Off Button

Published on 2011-03-19 03:29:51

In this simple circuit we give the chip a little more attention than usual. It is astonishing what can be built with a 555. We are always infatuated with simple circuits using this IC, such as the one shown here. The 555 is used here so that a single

One Of Nine Sequencer

Published on 2011-03-16 21:21:14

This novel circuit uses a flashing LED as the clock input for a 4017 decade counter. Typical flashing LEDs (eg, DSE cat Z-4044) flash at about 2Hz so the outputs Q0-Q9 will cycle through at that rate. For example, Q0 will turn on for half a second, t

Voice logic probe by transistor BC557

Published on 2011-03-15 23:27:28

The key is that the logic probe circuit, using a light emitting diode, or LED display is a state (high or low) point of the analysis, but on the other hand, it can display the state has the same voice. The circuit is shown, it is the audio source, cl

Push Off Push On

Published on 2011-03-15 23:03:52

The ubiquitous 555 has yet another airing with this bistable using a simple push-button to provide a push-on, push-off action. It uses the same principle of the stored charge in a capacitor taking a Schmitt trigger through its dead-band. Whereas the

Micro Maestro 6-channel USB Servo Controller

Published on 2011-03-15 22:56:49

The six-channel Micro Maestro raises the performance bar for serial servo controllers with features such as a native USB interface and internal scripting control. Whether you want high-performance servo control (0.25?s resolution with built-in speed

Regulator to improve better

Published on 2011-03-15 10:03:14

In some special applications, required supply voltage, which is very accurate, and It looks like, how popular each one. Then, to improve the output voltage of voltage regulator better. With “improve” the Commonwealth, (that is to increase

Pushbutton Relay Selector

Published on 2011-03-15 08:33:41

This circuit was designed for use in a hifi showroom, where a choice of speakers could be connected to a stereo amplifier for comparative purposes. It could be used for other similar applications where just one of an array of devices needs to be sele

Basic electronics parts set

Published on 2011-03-13 09:34:41

In the past I have experienced problems with electronic devices, hard to find, expensive, and there is no end equipment. I like Elenco – Basic Parts Set, because it helps to solve this problem. It is ideal for all basic electronics. More inform

Internal Resistance Tester For Batteries

Published on 2011-03-13 03:47:14

This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digi

Pump it up Mp3 Booster

Published on 2011-03-13 03:43:24

MP3 players are all the rage these days. The smaller ones in memory-stick format are particularly easy to take with you; your very own ‘personal sound system’ on the move! It’s when you want others to share your taste in music that you ?nd thes

Mini Logic probe with transistor circuit

Published on 2011-03-11 04:52:56

This is a Logic probe circuit is one,That is suitable for checking the voltage levels in the TTL circuit. It receives from the circuit being tested.Shows how high or low logic level one. The circuit when the input voltage to the probe Tip is higher t

Oscillator astable multi-vibrator with Crystal controller

Published on 2011-03-10 07:34:34

Oscillator circuit of this nature.Often used as a clock circuit.This circuit uses a million crystal frequency control with stability.And a circuit that does not use the capacitor or Inductor all. Each transistor to work, the amplifier with feedback.

Actron CP9580 Auto Scanner with CodeConnect

Published on 2011-03-10 03:40:23

The Actron CP9580 AutoScanner Plus OBD II, CAN & ABS Scan Tool is the ultimate choice in handheld automotive diagnostic scan tools, suitable both for advanced automotive do-it-yourselfers (DIYers) and automotive professionals alike. Not only doe

Resonance generators by 4011 CMOS Gate

Published on 2011-03-09 05:13:49

This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit.This circuit provides a higher f

Pipe Descaler

Published on 2011-03-09 01:08:45

For many years now, magnetic (or electromagnetic) water descaler devices have been showing up on the shelves of Home Improvement and other DIY stores all over Europe. Despite the numerous studies completed on that subject, by manufacturers as well as

Bosch PS30-2A 12-Volt Max 3/8-Inch Drill Driver

Published on 2011-03-08 19:04:01

Bosch PS30 – 2A 12 – Volt Max 3/8-Inch Driver Drill speed, power, and performance in a package compact portable. This powerful easy-to-use drill / driver features two three-speed head, jaw and efficient design, durable packs punch by main

MAXSA Innovations 40218 Motion-Activated Dual Head LED Security Spotlight

Published on 2011-03-08 18:53:50

This is one of the brightest solar-powered, motion-activated outdoor security spotlights on the market. Reposition the heads for wide illumination. The LEDs never burn out or need changing. This environmentally friendly unit ensures that you always h

Safety Guard by CD4060

Published on 2011-03-06 23:49:43

Simple unit, Protects home appliances from voltage spikes Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts osci

Streamlight 88031 Protac Tactical Flashlight 2L with White LED

Published on 2011-03-06 06:05:56

Streamlight Professional Tactical 2L LED Flashlight is an ultra compact tactical light by Streamlight. The Streamlite Professional Tactical 2L is a small C4 LED Flashlight and one of the brightest tactical personal carry lights for its size. The Stre

Simple slant (tilt) alarm switch circuit

Published on 2011-03-06 00:33:49

This is a simple alarm circuit.This work, when the switch S1 (sensor) tilted away from vertical.The alarm stops when the sensor back to the old form. S1 sensor is a mercury switch.Contact is a normal closed.When the switch is placed in a vertical.Tra

Very simple voltmeter with ic741

Published on 2011-03-05 23:30:22

This circuit can be used to measure the voltage to 15 volts.Using the current from the battery 9 volt,At 23 mA only. Input circuit has a diode, to protect the Return terminal. And input impedance of the circuit, were more than 1 M ohm. Heart of the c

Advanced 500 In 1 Electronic Lab

Published on 2011-03-05 10:06:01

We went one (or rather, 200!) steps beyond our 300 in one lab kit! Yes, 500 in one, PLUS comprehensive learning course manuals! Build 500 exciting projects, learn schematics, build and learn both analog and digital circuits, and even get into digital

booster 10,000x by One Transistor

Published on 2011-03-05 04:00:39

For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous trans

Sound pressure meter

Published on 2011-03-04 22:35:20

Here is a simple circuit that can be used to check the sound levels.The sound pressure meter is vey useful in setting up home theater systems , if you need to test the sound pressure of each channels on different positions in the room. The circuit is

Water Pump Relay Controller Circuit Schematic

Published on 2011-03-04 18:57:09

Water reservoir automatic level control Simple circuitry – 12V supply Device purpose: By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. Circuit operation: The shorte

A frequency multiplier in depth

Published on 2011-03-04 10:19:35

Most of the frequency multiplier circuit using IC phase locked loop (PLL).It will increase the frequency to an integer only. But this circuit can double the frequency, in the integer to a fractional number.This circuit has an IC phase locked loop num

Led light bar scan back and forth led two color

Published on 2011-03-03 00:07:07

This circuit is a circuit run on alternating two colors.It uses the 2-color LED with a built-in 3-pin single.This will chase away the glow of each LED until the end.It turns alternating to another color.In any way to the moon on the moon first end, t

Midnight Security Light Circuit Schematic

Published on 2011-03-01 05:55:44

Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical’ sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (su

Battery Tester For Deaf and Blind Persons

Published on 2011-02-28 07:01:48

Many blind and deaf-blind persons use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in this equipment. Talking voltmeters are available but there is no equivalent usable by deaf-bli

Remote Control Mains Switch

Published on 2011-02-26 18:48:56

As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and

Relay Coil Energy Saver

Published on 2011-02-26 18:47:12

Some relays will become warm if they remain energized for some time. The circuit shown here will actuate the relay as before but then reduce the ‘hold’ current through the relay coil current by about 50%, thus considerably reducing the amount of

Automatic Switch For Voltage Converters

Published on 2011-02-25 22:01:08

New applications for DC voltage converters, such as the ‘workhorse’ LT1070, arise every day. These converters can be adapted to nearly every imaginable ratio of input and output voltages. However, all of these circuits and devices have the same s

Smoke Alarm Battery Life Extender

Published on 2011-02-25 21:58:40

While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. Added to that is the irritation of random beeps from the alarm as the battery reaches the end of its useful life. This circuit allows typical s

A Very Simple LED Tester

Published on 2011-02-25 17:31:36

This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output current of the opamp flows through the diode and R2. The voltage d

IR Remote Control Tester

Published on 2011-02-24 22:32:30

This small circuit is ideal for checking the basic operation of an infrared remote control unit. The circuit is based on the brilliantly simple idea of connecting a piezo buzzer directly to an IR receiver IC. This method is almost as simple as connec

Romantic Rose USB 2.0 4-Port Ultra Mini Hub, Red Base

Published on 2011-02-24 21:53:14

There are a lot of USB 2.0 hubs out there, but none of them are as cute as this one. It is not only a hub, but also a perfect ornament for your room. * Offers lightweight, compact design-perfect for travel * Installs with Plug-and-Play ease-requires

Portable Lamp Flasher

Published on 2011-02-23 22:05:35

Here is a portable, high-power incandescent electric lamp flasher. It is basically a dual flasher (alternating blinker) that can handle two separate 230V AC loads (bulbs L1 and L2). The circuit is fully transistorised and battery-powered. The free-ru

Laughing Faces USB 2.0 4-Port Ultra Mini Hub

Published on 2011-02-23 18:47:39

There are a lot of USB 2.0 hubs out there, but none of them are as cute as this one. It is not only a hub, but also a perfect ornament for your room. * Offers lightweight, compact design-perfect for travel * Installs with Plug-and-Play ease-requires

Photo Picture Frame with Digital Recorder

Published on 2011-02-23 18:46:56

This photo frame with built-in digital recorder is the perfect gift for any occasion, or buy one for yourself! Records and stores audio messages for up to 100 years. Easy operation: just print and insert your photo in the frame and record your person

LED Tester Circuit Diagram

Published on 2011-02-23 18:46:32

You have to admit that these tiny electronic lamps are handy, and they last almost forever. Around 40 years after Nick Holanyak developed the first LED, they have become just about indispensable. Any self-respecting electronics hobbyist always has a

Bell Alarm

Published on 2011-02-23 07:59:38

If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace the switch with the circuit described here, an acoustical signal will be generated each time the outdoor lamp

Safe Oscillator For Watch Crystals

Published on 2011-02-23 02:00:35

This circuit was developed to allow watch crystals to be used in an existing CMOS oscillator circuit that was to run from a 12V supply. The problem is that these crystals only work up to a supply voltage of about 6V. Any more than that and the crysta

Components Voltage Tester Circuit Schematic

Published on 2011-02-23 00:32:16

This simple circuit tests speakers, microphones, transformers and voltage. It’s basically a very low frequency oscillator that produces extremely short ‘fruity’ pulses. The type of sound produced is very easy to hear and to determin

Xacto X75170 X-tra Hands with Magnifier

Published on 2011-02-22 23:40:34

The X-TRA Hands dual alligator clamps with 2X magnifying glass by X-ACTO is the perfect solution for any hobbyist or designer who needs a second set of hands to hold onto materials. These clamps will hold your work firmly in position, freeing your ha

Puchi Puchi Electronic Bubble Wrap Packaging Key Ring

Published on 2011-02-22 23:38:52

Puchi Puchi Electronic Bubble Wrap Key Ring Praised by Jonathan Ross on his show, he actually said its “..the greatest thing Ive ever owned…Isnt that the greatest thing you have ever seen in your entire life?” to see the video pleas

Smooth & Silky Ultra Shaver, Rechargeable

Published on 2011-02-22 23:36:31

Remington’s WDF-1600 has convenient and comfortable electric shaving with Body Contour SafescreensTM that hug your curves for quick, close, comfortable results. It features 2 SafescreensTM Protect your skin from nicks and cuts, 1 SmoothCutTM tr

Timer control 1-15 minutes by Triac 2N6075 and LM555-LM358

Published on 2011-02-22 00:37:00

Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer circuit.It uses a triac instead of electrical control.This can be used with a 220V power house i

Clap-Controlled Switch

Published on 2011-02-21 23:21:22

This circuit can switch two or more devices on and off in response to a series of rapid handclaps. The claps are picked up by an electret microphone and amplified by a 741 op amp (IC1). IC1 is configured as an inverting amplifier, with its gain and h

Electronic Touch Switch

Published on 2011-02-21 22:42:04

Mechanical contacts have the disadvantage that they wear out. That is why it is practical to use an electronic ‘touch switch’ in some situations. With such a touch switch the resistance of the human skin is used for the switching action. The sche

Auto Power Off

Published on 2011-02-21 22:38:09

We are surrounded by battery operated equipment of all kinds, and this array is growing still. Manufacturers and designers lean over backwards to make sure that their equipment draws a small current and can thus be operated by a battery. This has its

Weller SP23LK Marksman 25 Watt Soldering Iron Kit

Published on 2011-02-21 21:09:29

The Weller SP23LK Marksman 25-Watt Soldering Iron Kit has everything you need to get started soldering. An ideal choice for hobbies, crafts, and small electronics work, the kit contains a soldering iron, stand, nickel-plated tips, solder, and solderi

Water Alarm Circuit Diagram

Published on 2011-02-21 21:05:50

Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you’ve come home to find your aquarium fish trying to swim across the carpet? For your sake, we hope not, because the consequences are usually f

Remote Alarm For Smoke Detector

Published on 2011-02-21 10:15:04

This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which

Mains Supply Failure Alarm

Published on 2011-02-21 10:05:22

Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. P

Flashing-LED Battery-status Indicator

Published on 2011-02-21 08:41:33

Signals when an on-circuit battery is exhausted 5V to 12V operating voltage A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the user’s attention, s

Car and Motorcycle Battery Tester

Published on 2011-02-21 00:56:19

Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power inverter would be used to ensure a smoothly organized holiday wh

Automatic Low-Power Emergancy Light

Published on 2011-02-20 23:46:24

Portable, simple and inexpensive unit, Useful for personal use Here is a white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fa

Belkin Pivot-Plug Surge Protectors

Published on 2011-02-20 22:58:27

You’ve got a lot of money invested in your home computer and peripherals, so you need to protect them. The Belkin BP112230-08 12-Outlet Pivot-Plug Surge Protector, with its unique rotating outlet design, is built to give you the peace of mind y

Hello Kitty Bracelet Walkie Talkie Set

Published on 2011-02-20 21:56:50

These Hello Kitty Bracelet Walkie Talkies can be camouflaged as bracelets so you can secretly talk to your friends. Requires (4) pcs each: AG13/LR44 1.5V Button Cell Batteries (INCLUDED) Ages 5+. Read more

On Off Touch Switch Circuit

Published on 2011-02-20 21:40:06

Small and portable unit, Suitable for normal-type devices The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger than the durability of certain swi

10 LED roulette with TC4011-LM4017

Published on 2011-02-20 03:15:49

When entering the power supply circuit, and switch S1 (Start), which is attached press release switch off.Then current is flowing through R1, R2, and C2. Makes the capacitor C2 caused up When the switch S1 allows the C2 to discharge through R3. The p

Smooth Flasher Circuit Diagram

Published on 2011-02-19 23:35:10

Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes: the light intensity changes very slowly and sinusoidally, helping to generate a relaxed mood.

LCD Weather Station and AM/FM Stereo Radio with Talking Alarm Clock

Published on 2011-02-19 20:42:25

AM/FM Clock Radio Digital Tuning System (DTS) AM/FM Sleep Timer Wake-up Radio Alarm Program Radio Channel Settings (Memory Set) Calendar 12/24 Clock Temperature/Weather Center Display Indoor Temperature Display Outdoor Temperature (one RF 433 MHz out

Arduino UNO

Published on 2011-02-19 20:39:48

Before I bought this unit, I had never used an independent micro-controller. I used digital IO boards years ago while in college but those were always connected to a computer. I needed a self contained unit for a project and found a lot of recommenda

Continuity Tester Circuit Diagram

Published on 2011-02-19 20:36:46

Having good contacts is important – not only in your daily life, but also in electronics. In contrast to social contacts, the reliability of electrical contacts can be checked quickly and easily. Various types of continuity testers are commercially

Digital temperature sensor

Published on 2011-02-19 07:41:30

Here is a straight forward ,yet effective digital temperature controller that can be used with temperature control systems. The circuit uses IC LM35 (IC3) to sense the temperature.The output of LM35 is given to the IC ADC0804 (IC4) which converts the

220Vac Lamp Toggle Switch

Published on 2011-02-19 07:35:34

Compact, transformerless circuitry No relays employed Due to the low current drawing, the circuit can be supplied from 230Vac mains without a transformer. Supply voltage is reduced to 12Vdc by means of C1 reactance, a two diode rectifier cell D1 

Temperature Sensitive Switch For Solar Collector

Published on 2011-02-19 01:10:20

This circuit can be used to turn the pump on and off when a solar collector is used to heat a swimming pool, for example. This way the water in the collector has a chance to warm up significantly before it is pumped to the swimming pool. A bonus is t

Slave Flash Trigger

Published on 2011-02-18 22:39:48

The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually not powerful enough to take a satisfactory picture. Unfortunately most such cameras do not i

Fully Automatic Emergency Light

Published on 2011-02-18 22:14:48

This simple automatic emergency light has the following advantages over conventional emergency lights: 1. The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight

AmazonBasics USB 2.0 A-Male to A-Female Extension Cable

Published on 2011-02-18 20:49:08

The AmazonBasics USB 2.0 A-Male to A-Female Extension Cable with Gold-Plated Connectors lets you extend your USB connection by 9.8 feet and offers full performance for all your USB devices. If you need a longer USB 2.0 cable to connect a peripheral t

Midnight Security Light Circuit Schematic

Published on 2011-02-18 11:20:03

Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical’ sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (su

Cell Phone Signal Booster Kit for Vehicle w, Low Profile Antenna – for Multiple Users

Published on 2011-02-18 11:17:04

Increase your cell phone’s signal by up to 25 times with the Wilson Cell Phone Signal Booster Kit. Designed for use in your car, truck, RV, or boat, the booster kit significantly improves your cell phone’s performance and signal strength.

Dancing LEDs

Published on 2011-02-18 11:15:56

LED sequencer: follows the rhythm of music or speech 9V Battery-operated portable unit The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive u

RC (Remote Control) Switch with TLC555

Published on 2011-02-18 03:05:48

It is sometimes necessary for an RC (remote control) model to contain some kind of switching functionality. Some things that come to mind are lights on a model boat, or the folding away of the undercarriage of an aeroplane, etc. A standard solution e

Snap Circuits RC Rover

Published on 2011-02-18 02:48:49

Simple, Fun Projects Let Kids Learn While They Play With its easy-to-follow instructions, Snap Circuits gives your child a hands-on education in how electrical circuits work to run their rover and the everyday devices that they’re familiar with

Snap Circuits FM Radio

Published on 2011-02-18 02:41:11

Elenco’s Snap Circuits makes learning electronics easy and fun! Just follow the colorful pictures in our manual and build exciting projects such as AM radios, burglar alarms, doorbells and much more! You can even play electronic games with your

IR Remote-Control Checker

Published on 2011-02-18 00:02:39

Suitable for any Infra-red emitting device 3V battery supply A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reli

Switchable Output Crystal Oscillator

Published on 2011-02-17 21:59:08

This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that all diodes are shorts and their associated 1kO resistors open. The t

Computer Data Cable Tester

Published on 2011-02-17 21:57:33

You don’t need access to fancy test gear to check and fault-find computer data cables. Instead, this simple device will give a quick indication of the status of point-to-point cable wiring; ie, crossovers, shorts and open circuits. It works lik

High impedance DC voltmeter.

Published on 2011-02-17 21:53:49

A high impedance DC voltmeter using a uA741 IC is shown here. The operational amplifier is used as a non-inverting DC amplifier in which the negative feedback is through a DC meter requiring 1mA for full scale deflection. Since R6 is 100 Ohms, the me

Fridge door Alarm

Published on 2011-02-17 09:42:34

Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the

Cheap AC Current Measurement

Published on 2011-02-17 09:39:05

The easy way to measure high AC currents is to use a clamp meter but these are generally quite expensive and cost several hundred dollars at a minimum. Add-on clampmeter adaptors can work well but they only work with digital multimeters which have mi

Arduino Duemilanove

Published on 2011-02-17 09:26:15

Arduino 2009 board is very good for learning microcontrollers. Because everything is ready, available. Easy to use, connects to PC via USB, uses Java technology efficiently. Hundreds of projects available FOR FREE, since it is OPEN SOURCE. A. Andreat

Water-level Alert

Published on 2011-02-17 00:54:55

Beeper or flashing LED alert 1.5V battery powered portable unit This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e

Fire Alarm Using Thermistor

Published on 2011-02-17 00:45:24

Small and simple unit, Can be used for Home-Security purpose In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal temperature, the resistance of the Thermis

Low Ohms Adaptor For DMMs Based On An LM317 Regulator

Published on 2011-02-16 21:48:16

This adaptor circuit is essentially a 100mA constant current source. It is applied across a low-value resistor of unknown value (ie, the resistance to be measured) and the resulting voltage drop can then be measured by a digital multimeter (DMM). Set

Simple Logic Probe

Published on 2011-02-16 21:13:13

This simple logic probe has both LEDs on with no signal at the input but due to the nor gates connected to the probe, indicates correctly when a high or low signal is present. It also works correctly for pulse trains. Normally both LEDs are forward b

Hyper-Simple Battery Capacity Tester

Published on 2011-02-16 09:59:17

The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connecting a resistor across the battery terminals, the battery is discharged somewhat faster than with the clock alone

Harmonic Generator With Single Opamp

Published on 2011-02-16 09:55:37

Quartz crystals have the property that their amplitude/phase characteristic repeats itself at frequencies that are an uneven multiple of the fundamental frequency. There are so-called overtone crystals that are cut in such a manner that they possess

IC Controlled Emergency Light With Charger Circuit

Published on 2011-02-16 08:39:02

Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on ma

High-intensity LED Warning Flasher

Published on 2011-02-16 01:01:47

This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only are recommended if the circuit is u

12V Dimmer

Published on 2011-02-16 00:58:11

A dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the mood when you’re entertaining friends and acquaintances, then this circuit enables you to do so. Designing a d

Ultra Bright LED Lamp for AC230V

Published on 2011-02-16 00:53:10

This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light li

Battery Tester Circuit Schematic

Published on 2011-02-15 07:36:08

Is the battery empty, or is there something wrong with the device? That’s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the

Put That Light Out

Published on 2011-02-15 06:52:47

If you forget to switch off the light after leaving a seldom used room (such as the loft), there’s a strong likelihood that it could remain lit for months, running up an expensive power bill in the process. How can we prevent this waste? It’s not

USB Experimenter’s Interface Board

Published on 2011-02-15 06:19:15

Not so long ago the universal answer for external control from a PC was the serial port. It was easy, it was simple, and you really couldn’t mess anything up! Then came parallel port outputs for higher speed connections and transfers. What came

Two wire Lamp Flasher using BD139

Published on 2011-02-15 00:48:43

Ideal to operate 3 to 24V DC existing on-circuit lamps This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially sui

MAKE: Electronics: Learning Through Discovery

Published on 2011-02-15 00:42:21

Build working devices, from simple to complex You’ll start with the basics and then move on to more complicated projects. Go from switching circuits to integrated circuits, and from simple alarms to programmable microcontrollers. Step-by-step i

Getting Started With Arduino book parts pack

Published on 2011-02-15 00:40:28

This pack contains the parts needed to try the exercises listed in the Getting Started with Arduino book. It includes a mini breadboard, LEDs, a DIODE, a TRANSISTOR, RESISTORS, a SWITCH and LDR. It tries to match the components listed and used in the

Love test game circuit by 8 LED

Published on 2011-02-14 18:21:13

This circuit uses the nand gate IC number is 4011B per Clock signal generator circuit, feeding it with the pin number 14 of the IC counter circuit 4017B.When you press and hold the switch S1 C1 will discharge. Causing current flow through D1 as a res

USB Controlled DMX Interface Kit

Published on 2011-02-14 16:15:56

At this point some of you may be wondering… “um, what is a DMX interface?” While it’s not something you would find in a typical home, it’s widely used in stage and music productions. DMX is short for an EIA-485 based com

Circuit Board Tester

Published on 2011-02-14 08:48:54

Indicates the basic integrity of a printed board Self-powered – 3 to 30V range This little circuit indicates the basic integrity of a printed board, detecting 0V, positive supply voltage from less than 3V to 30V and floating parts. If the probe

Quick On-Board Junction Tester Circuit Diagram

Published on 2011-02-14 07:24:14

Acoustic check of transistor and diode junctions, Also suitable as continuity tester Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transist

Solar Lamp Using PR4403

Published on 2011-02-14 05:05:16

The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it very easy to build an automatic LED lamp using a rechargeable battery and a solar module. The LS

Two-Led Pilot Light

Published on 2011-02-14 02:29:01

220vAC mains operated, Very simple circuitry This circuit is designed on request and can be useful to those whishing to have, say, a red LED illuminated when an appliance is on and a green LED illuminated when the same appliance is off. Any mains ope

Remote controlled appliance switch circuit

Published on 2011-02-14 02:27:58

Here is a versatile remote controlled appliance switch that can ON or OFF any appliance connected to it using a TV remote. IR remote sensor IC TSOP 1738 is used for recieving the signal. Normally when no signal is falling on IC3 the output of it will

Ultraportable Speaker for MP3 Players

Published on 2011-02-14 02:15:04

The compact, portable iM-237 Orbit M speaker system is an ideal way to share your MP3, CD player, music-enabled phone, or laptop tunes anytime, anywhere. Slip it out of your pocket or purse for an instant audio broadcast. Just plug and play–the

Emergency Light and Alarm

Published on 2011-02-13 21:37:01

Powered by two AA NI-CD batteries, Four switchable options This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp

Philips SBA1700/37 MP3 Portable Speaker

Published on 2011-02-13 21:33:23

Move with your music! Enjoy stereo sound wherever you go on a stylish travel speaker with folding stand. Secure the line-in cable to use as a lanyard for easy portability. Inside, a digital amplifier eliminates mobile-phone interference. Read more

audio wattmeter circuit

Published on 2011-02-13 18:42:43

This is an easy trick to measure the output of an amplifier.Here resistor R2 acts as the load for for the amp and it should be able to withstand twice the maximum power of the amp you are going to measure.The meter scale must be calibrated and with a

Philips in-Ear Headphones Crystal Sound

Published on 2011-02-13 18:42:00

Philips in-Ear Headphones Crystal Sound SHE9620/28 Rose Gold * Philips in-Ear Headphones Crystal Sound SHE9620/28 Rose Gold * Ultra thin diaphragm delivers clarity and detail sounds Angled Acoustic Pipe channels directional and precise sound * Except

9,000-BTU Portable Air Conditioner

Published on 2011-02-13 18:40:21

Newest addition to SPT’s Portable AC family Dual Hose System with Self Evaporating Technology. This 9,000btu, 3 in 1 system provides multi-season comfort. Designed to efficiently cool, dehumidify any space without permanent installation. Effect

Magnetic proximity switch using CD4013-NE555

Published on 2011-02-13 06:13:54

Here is the circuit diagram of a magnetic proximity switch that finds a lot of applications in many fields.The circuit is based on a magnetic reed switch(S1) as the proximity sensor. A monostable multivibrator based on NE555 (IC1) and a toggle flip f

Dew sensitive switch with opto-coupler

Published on 2011-02-13 04:51:46

Here is a simple circuit that can be used to switch ON or OFF a device when the dew present in the surrounding atmosphere crosses a set value.The circuit uses a dew sensitive resistive element and a comparator based on LM 358 to perform the above sai

Flashing Eyes by BC557

Published on 2011-02-13 00:54:08

Two-LED-eyes follow the rhythm of music or speech, 3V Battery-operated device suitable for pins or badges This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear of a badge or pin bearing a typical Halloween c

Red Crystal Heart USB Drive 2GB

Published on 2011-02-13 00:12:35

2GB USB Drive with beautiful red crystal heart on keychain. Two halves have a magnetic clasp for additional security. Perfect gift for Valentine’s Day Read more

Dark Activated Led or Lamp Flasher

Published on 2011-02-12 21:30:55

Simple photo-sensitive circuit, 3V battery supply This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. The LED starts flashing when the photo resistor

Beautiful 5 Arc Satin Nickel Finish Floor Lamp Nice Valentine’s Day Gift

Published on 2011-02-12 21:29:40

These lamps are unique and fun!It’s Classical Design is perfact for any Living Room.It is space saving and is perfect to place at corners or against the wall. Make this item today apart of your home decor furniture or get it as a gift for someo

Simplest lamp flasher circuit with relay

Published on 2011-02-12 21:27:44

This is a very simple lamp flasher circuit that uses only three components (a capacitor, relay and one resistor) other than the lamp. The working of the circuit is very straight forward. When the power is switched ON the capacitor C1 charges through

Street light circuit

Published on 2011-02-12 11:28:25

The circuit diagram present here is that of a street light that automatically switches ON when the night falls and turns OFF when the sun rises.In fact you can this circuit for implementing any type of automatic night light. The circuit uses an LDR t

Oregon Scientific RM313PNA Self-Setting Projection Clock

Published on 2011-02-12 11:23:22

From technology leader Oregon Scientific, this versatile clock shines the time on the bedroom wall with its projection function. The radio-controlled clock regularly resets to the US atomic clock in Boulder, CO for the utmost precision and adapts aut

Remote toggle switch circuit

Published on 2011-02-12 08:49:58

In application level this circuit is similar to that of the circuit given previously. The only difference is in the approach. This circuit is designed by using another method. Using this circuit you can toggle any electrical appliance between ON and

Courtesy Light by 7555 or TS555CN

Published on 2011-02-12 08:46:32

15 seconds delayed switch-off, A good idea for bedroom lamps This circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the lamp really switches off. Obviously, users

Dark Activated Terrace Lamp

Published on 2011-02-12 00:06:56

Compact circuit, Can be wired in parallel to existing switches This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is

Hall Effect switch

Published on 2011-02-11 23:07:30

The circuit diagram shown here is of a Hall Effect switch. Hall Effect sensor IC DN6848 from Panasonic is the heart of the circuit. The DN6848 has a built-in Hall Effect sensor, Schmitt trigger circuit, power supply regulator and temperature compensa

Neon Light With USB Port Plug – Double Hearts Love Themed

Published on 2011-02-11 21:41:10

This neon light is fun. You just plug it in your port on your computer. I got one for myself and my daughter and she also loves it. Gives out lots of light. It is made well and not expensive. Thanks Amazon. Read More

Set of 100 Pink Mini Christmas Lights – White Wire

Published on 2011-02-11 21:36:06

These lights are made to commercial specifications If one light goes out the rest will stay lit Lights are equipped with Lamp Lock feature, which makes them replaceable, interchangeable and keeps them from falling out. Replaceable bulb, fuses, and bl

Kikkerland Window-Mount Solar-Powered Heart Rainbow Maker

Published on 2011-02-11 21:29:42

This item will indeed throw lights and prisms all over your house. It must be placed in direct, strong sunlight to move, but it will throw static lights in weaker sunlight. If you have a retarded cat that chases after lights, this will provide the li

BLUE 5LED NEON MOTORCYCLE-CAR-BOAT-HOME-POD-LIGHT-BRIGHT 5 LED ACCENT GLOW

Published on 2011-02-11 21:17:43

This DIY 5 LED spreader comes with 5 bright LED bulbs mounted in a 16mm X 10mm X 65mm enclosure. The two outer set leds are at a 45 degree angle, the two mid set are a 60 degree, and the center led is 90 degree. They come with 3 foot long, 22 gauge a

ST6U StripBoard-6U, Accepts DIN Conn.s, 1 Sided PCB, 6.30 x 9.19 in

Published on 2011-02-11 21:09:28

ST6U StripBoard is a prototyping circuit board with a standard stripboard pattern, with tracks running the length of the board. It has 0.1″ hole spacing for DIP integrated circuits and headers and other parts.ST6U is a standard double height (6

led light running arrows showing the position

Published on 2011-02-11 09:51:32

This is a led light running circuit with a number generated from IC CD4093, CD4520 and CD4094.This circuit can adjust the speed with resistors R1.When entering the power supply to the circuit IC1. A nand gate IC Oscillator generator circuit is connec

Aircraft warning light circuit

Published on 2011-02-11 07:42:04

Here is low cost circuit that can be used for implementing a warning light on the top of tall structures as a warning for low flying aircrafts.Usually such lights are just stay glow type .Here our light is a flashing type, and surely this will draw m

Lamp pulser circuit with LM358-BC337

Published on 2011-02-11 05:23:34

Here is a simple circuit that can be used to pulse an LED or a low power filament lamp. The effect is such that the LED lights up from OFF state gradually and then dims gradually. Such a circuit is very useful in decoration purposes. The circuit is n

Cables Unlimited USB 2.0 to Serial DB9 Adapter

Published on 2011-02-11 01:22:46

This adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require a serial connection and many newer computers don’t have serial ports. This fully plug an

StripBoard-3U Uncut Strips 1 Sided PCB

Published on 2011-02-11 01:19:55

ST3U StripBoard is a prototyping circuit board with a standard stripboard pattern, with tracks running the length of the board. It has 0.1″ hole spacing for DIP integrated circuits and headers and other parts.It has higher quality than traditio

Digital Oscilloscope-40MHz

Published on 2011-02-11 01:05:45

It ‘s different models of portable scopes, meters, and scope/meters. Weve also seen the price tag! Unless you were a field tech with a good sized test equipment budget, they were out of the question. These Personal Scopes have changed all that,

50 Watt MOSFET amplifier using IRF530-IRF9530

Published on 2011-02-09 03:13:00

The first stage of the amplifier is a differential amplifier based on transistors Q1 and Q2. Capacitor C8 is the input DC decoupler, R1 limits input current and capacitor C1 bypasses unwanted high frequencies. The second stage is the driver stage con

Audio Distortion Meter

Published on 2011-02-09 01:35:09

Here is a simple 1KHz audio distortion meter that can measure the Total Harmonic Distortion (THD) on any load at any out put power.Here you have the option to select 2,4,8 or 16 Ohm loads. The circuit works by filtering the 1 kHz fundamental signal u

Dual Tone Train Horn Circuit

Published on 2011-02-08 04:17:55

A dual tone train horn simulator circuit can be made using two NE 555 timers connected in cascade.Here istead of using two NE 555 timers a single NE 556 timer is used which is a nothing but two 555?s in one package and each timers work independently.

Simple audio level meter circuit

Published on 2011-02-07 06:28:37

A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source.This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a flat frequency response in

Simple Field strength meter

Published on 2011-02-07 02:46:13

Here is a handy field strength meter that can be used to check the strength of AM radio signals.The circuit is a very useful for those who assemble radio transmitters(especially in the tuning of the final stage for maximum range). The circuit is esse

Simulate the traffic light circuit

Published on 2011-02-05 11:12:00

You would never suspect. Traffic jam at the intersection. He do? Has opened the green light and red light. Or to have people turn off. To resolve the question, we try to create this same circuit. Operation of the circuit is IC1 (NE555) is the origin

Micro ampere meter circuit using uA741

Published on 2011-02-04 21:48:16

The micro ampere meter shown here is basically a DC millivolt meter.The circuit gives full scale deflection for 0.1V input.The current to be measured is passed through a known resistance R and the voltage drop across it is measured.Here the IC 1 uA 7

Led light based music stereo with multi system

Published on 2011-02-03 19:14:35

This circuit is another name for the VU meter. which often have a lot of equipment. Cause problems for people who start training. But this cycle is not much equipment. You can also choose, in the. Running a bar or run with a point. Operation of the c

Signal tracer circuit

Published on 2011-02-03 00:08:07

A high gain amplifier circuit that can be operated from a battery pack of 6 or 9 volt battery pack is shown here.The IC1 uA 741 is wired as a high gain non-inverting amplifier and its output is amplified by a pair of complementary transistors (Q1 �

Temperature controlled DC fan by BD140

Published on 2011-02-02 00:41:34

Here is a simple circuit based on two transistors that can be used to control the speed of a 12 V DC fan depending on the temperature.A thermistor (R1) is used to sense the temperature. When the temperature increases the base current of Q1 (BC 547) i

Guitar pre-amplifier using uA 741

Published on 2011-02-01 21:33:39

A preamplifier circuit suitable for high impedance type electric guitar pickups is given here.The circuit is based on a uA 741 op-amp (IC1).The IC1 is wired as a non-inverting amplifier.The POT R1 can be used as a volume controller.The POT R6 can be

TDA4935 bridge amplifier

Published on 2011-01-29 07:52:59

TDA4935 is 2x15W high quality audio amplifier IC from Siemens. The IC can be used in stereo mode or bridge mode. In stereo mode it can deliver 15W per channel and in bridge mode it can deliver 30W into a 8 ohm load at 30V supply. TDA4935 requires ver

Tap tempo circuit using ic cd4011

Published on 2011-01-27 23:38:39

This circuit will have an effect than Tap the rhythm circuit other because the whistle is giddy, which vividly than usual knock. You can also adjust the speed with 10-40 strokes per minute. Operation of the circuit, we will be divided into three main

Ringing phone light flasher

Published on 2011-01-27 03:25:53

This circuit can be used to glow a bulb or turn a alarm when the phone rings.Using this circuit nuissence of telephone ring at night can be avoided. When the telephone rings the line voltage rises to 72 volts.At this time the LED in the opto-coupler

Telephone operated DTMF remote by KT3170

Published on 2011-01-26 08:35:43

The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of the telephone. Digit 0 is used to switch the telephone system between remote switching mode and normal conversa

Music box automatically with IC UM66T

Published on 2011-01-23 09:20:00

This is an integrated music box Self Promotion Nat, when I open the music box to hear the music out. You can choose music in several voices, just change the IC number only. Operation of the circuit is when the power supply and switch S1. The IC IC1 i

Multi level power supply with 78xx series

Published on 2011-01-19 10:23:35

This is an electrical circuit to supply DC power positive and negative. It also has multiple power levels as well. The equipment it easy to buy and affordable. Operation of this circuit, when T1 was to convert the AC voltage from 220 volts down to 15

Class A audio amplifier 5W using IC-NE5532

Published on 2011-01-17 10:49:54

Among the final amplifier we called. Regional Power Amp, will it work on several well-known as Class A, Class B, Class AB etc. Each class of the above, to honor the Class A was superior to the sound quality. best. However, class A power output to a l

usb light for notebook

Published on 2011-01-11 08:23:17

When more work constantly. Son and uncomfortable, symptoms need to sleep watching the ball. I tend to use the laptop in the bedroom with him, but it will turn the lights in the room will interfere with his son, not that close to sleep. So I thought a

Random number with led 1 digit

Published on 2011-01-07 10:52:47

This is a circuit diagram showing the random nature of LED 7 segment. In the diagram circuit IC1 – LM555, R1, R2 and C2 on the circuit a sensitive multi-Stable Brett Foster (Astable. multivibrator circuit) function generator signal square (Squa

Reducing Relay Power Consumption

Published on 2011-01-06 00:44:09

Relays are often used as electrically controlled switches. Unlike transistors, their switch contacts are electrically isolated from the control input. On the other hand, the power dissipation in a relay coil may be unattractive for battery-operated a

Handy Time Delay With Relay Output

Published on 2011-01-04 02:42:39

This circuit is designed to provide delayed relay switching action at power on. The delay is a function of the time constant produced by the combination of R1 and C1. At power on, C1 charges slowly via R1 and the coil of the relay. When the voltage a

Momentary Switch Teamed With Latching Relay

Published on 2011-01-01 20:38:37

This circuit allows an SPST momentary pushbutton to act as a push-on push-off switch, using a DPDT latching (bi-stable) relay. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function.

Audio Amplifier Output Relay Delay

Published on 2010-12-31 09:14:57

This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circ