Recent Updates: Many circuit project electronics

Visit For Recent Updates.

Already a Member? Log In to Your Account
This Blog Posts All Posts Directory Listings Articles

Dual RS232 port selector circuit

10/29/2014 04:57:42 AM

This is a Dual RS232 switch selector circuit to one computer that have one RS232 port into two ports for two computers. In circuit is simple and cheap without ICs so easy to build. Normally, we will always use the D connector because strong, can be p > read more

20A/ 12V-24V DC Motor controller using TL494 and IRF1405

10/28/2014 00:53:33 AM

This is the high quality PWM 12V-24V DC motor controller circuit for that has the low voltage battery checker system, working with soft start, adjust pulse frequency, use for 12V or 24V battery at current up to 20A. Although small and simple, but cou > read more

One button code Switch

10/25/2014 22:25:09 PM

The most code switch will be a key number 1 to 10 is good. But when I press a number key often until has track, making it possible to guess the code. This circuit use the normal door bell switch is the code enter. The code include pulse short and lon > read more

Current Transformer AC Load LED Indicator circuit

10/24/2014 23:31:41 PM

This is the LED indicator for show AC current load, that use the transformer and LED as based of circuit. Sometimes we need to detect the large AC current. One way is the LEDs is connected with the resistors and the diode 1N4001 networks. But this ha > read more

VHF Dip Meter circuit

10/23/2014 23:18:05 PM

This is a simple VHF dip meter circuit.The DIP meter is the frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude. The circuit include variable frequency generator circuit, rectifier and a moving coil > read more

Digital logarithmic sweep signal generator circuit

10/23/2014 00:14:33 AM

This is a Digital logarithmic sweep signal generator circuit by use the average digital, It is designed to use together with the frequency generator by voltage controller. How it works From the circuit in figure 1 is the 14-bit binary counter circuit > read more

Tape head preamplifier using UPC1032

10/22/2014 09:09:38 AM

This pre-tape circuit is cheapest for beginner only. And easy to builds because use one IC-UPC1032 only as Figure 1. Fig1: The circuit diagram This is stereo can connect to the tape header that resistance between 200-600 ohms at output amplitude abou > read more

5 volts DC Regulator Without Transformer Using MOSFET

10/22/2014 02:37:38 AM

This is 5 volts DC Regulator power supply that without the transformer so small size, use the MOSFET is based. It is suitable the digital circuit. Caution! This circuit requires very careful to create. Because there is a high voltages many areas. The > read more

10V to 350V Adjustable Regulator DC Power Supply

10/21/2014 07:32:36 AM

Here is an adjustable regulator DC power supply circuit that can be provided the output high voltage is 10V to 350V. It use the transistor is based so we use often use them. Now, a transistor can tolerate more high pressure. For example; in this circ > read more

Electric fish shocker circuit

10/18/2014 05:04:18 AM

This is the simple electric fish shocker circuit or fish stunner. It helps in catching fish easier, it use 12V battery to convert to 220V AC. We use few parts so easy and cheap. How it works This circuit convert voltage from 12V battery to AC 220 vol > read more

NE5532 datasheet; Dual low noise operational amplifier

10/17/2014 07:16:08 AM

NE/SA/SE5532/5532A: Internally-compensated dual low noise operational amplifier The 5532 is a dual high-performance low noise operational amplifier. Compared to most of the standard operational amplifiers, such as the 1458, it shows better noise perf > read more

5 watts Class A amplifier using NE5532 and MJ2955

10/16/2014 20:28:54 PM

> read more

How to build the PCB by yourself

10/11/2014 10:24:54 AM

Creating a PCB is difficult. If you want to create your own PCB. I find good information on various websites. For the benefit of friends. This week, I collaborated with Xander to show you how to make your own printed circuit boards (PCBs) using a las > read more

Automatic duty factor controlled circuit

10/11/2014 06:03:50 AM

We can use the schmitt trigger to generate the simple square wave. The duty factor of output waveform will be determined by the input waveform. But the threshold level is the importance. In Figure 1 will have the output while input waveform as Figure > read more

Linear opto isolator circuits

10/10/2014 11:07:05 AM

This is the linear opto isolator circuits that use a few parts and cheap. In circuit we use the opto compiler ICs number of MOC 5010 as based. It can be used many ways. For example ; separate the circuit from the power line, send audio signal, Electr > read more

LM386 audio amplifier circuit with PCB

10/09/2014 19:15:48 PM

This is an audio amplifier that can be used with a small 9 volt Battery Operated,Current use as little as 5 milliamps.And amplification up to 500 mW. Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speak > read more

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

10/09/2014 05:48:27 AM

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 2 Amp. It suitable for general electronics work shop. Because it is a simple ci > read more

0-30V,0-2A adjustable voltage and current regulator

10/08/2014 03:17:22 AM

This is the 0-30V,0-2A adjustable voltage and current regulator that developed from the cheap adjustable 0-30V 2A Laboratory DC Power Supply project using LM723 is used widely, for a long time. This project can control the amount of current flow is m > read more

True R.M.S Converter circuit

10/07/2014 00:05:24 AM

This is a true r.m.s. Converter circuit. it use parts that easy to find and the normal quality. But we must to use normally parts that Low tolerances and more precise tuning. This use principle of the automatic gain control circuit; AGC). Which inclu > read more

Duty factor meter circuit

10/04/2014 06:41:20 AM

This is the simple duty factor meter circuit. We use mosfet and meter and more few part. So easy and cheap than others tools. How it works. The duty factor of square wave signal can be measure by the pulse counter circuit or the oscilloscope. Figure: > read more

Cheapest signal cleaner circuit

09/29/2014 18:23:18 PM

Here is the simple low noise filter circuit for any FSK signals that weak and have noise. This use few parts so easy and cheap. Fig 1: The schematic of this project As Figure 1 is the schematic diagram. This circuit include the low filter circuit thr > read more

Traffic light controller circuit

09/28/2014 09:15:10 AM

Today, let’s look at 2 model of traffic light circuits. They use the LEDs for display and the digital circuit as based. This circuit include IC-4027,CD4017,IC-555 and a few parts so easy and cheap. First model circuit. This circuit is designed > read more

CD4027B_datasheet of Dual J-K Flip-Flop

09/26/2014 05:40:03 AM

Here is the datasheet of the CD4027BC dual J-K flip-flops are monolithic complementary MOS (CMOS) integrated circuits constructed with N- and P-channel enhancement mode transistors. Each flip-flop has independent J, K, set, reset, and clock inputs an > read more

The experience to Buy the components at

09/25/2014 02:47:47 AM

Sometimes I can not buy electronic devices. Because, far from an electronics store. No products you want, or expensive. I always use the online order. I envy my friends who live in America. That they can order electronics from There are a > read more

Simplest slave flash trigger circuit

09/24/2014 10:23:42 AM

- This is a simplest slave flash trigger circuit. - It will help the slave flash immediately works almost simultaneously with the main flash. - This circuit better than others circuits because without the external power supply. - Since (look at circu > read more

Power Amp Super Bridge 120W by IC TDA2030

09/23/2014 04:14:35 AM

This be Super Bridge 120W Power Amplifier by IC TDA2030 for you like the circuit amplifies that use the integrated circuit. and Transistor BD249 or TIP31 or TIP41 or C1061 and BD250 or TIP32 or TIP42 or A671. It is nice circuit and easy to use. Schem > read more

Inverter 12V to 220V 100W by Transistor

09/19/2014 03:45:46 AM

This circuit is 100 watt power inverter using power transistor 2N3055. It is designed for you that need to use appliances at outdoor or no electrical places. Someone use it in car or the high mountain etc. The maximum output power of this circuit abo > read more

555 audio ohmmeter circuit

09/18/2014 10:24:16 AM

555 audio ohmmeter circuit This is a 555 audio ohmmeter circuit. Some times, we need to measure roughly the resistances only. In this we can know the resistances by the audio so also fast check. This circuit will use the resistors that unknown value > read more

Wien bridge oscillator circuit

09/17/2014 10:49:09 AM

This wien bridge oscillator circuit which is normal,low distortion and can easily adjust the resonance frequency that depends on the pair of the resistors (R) and capacitors (C). Which we can calculate by the formula. F = 1/2 p RC In this circuit as > read more

3000 watts Dimmer for Inductor Load

09/13/2014 09:19:34 AM

This is the 3,000 watts Dimmer for inductor load example: the Electric Fan, AC motor,Electric drill etc. But most general dimmers is used for resistors load only such as lamp, soldering iron, heating coil,etc. Why our project can do? The normal dimme > read more

Multiples ways to increase the power supply current

09/11/2014 19:48:11 PM

If a DC power supply not enough for your job. The most cause come from the lower current of the transformer,which changing them is hard and expensive. This way maybe help you! Since the most transformers always is the center trap form for a dual powe > read more

Easy Telephone Amplifiers circuit

09/11/2014 00:32:22 AM

This is an easy telephone amplifier circuit. It will increase the signal of the telephone lines up. Then, drive the relay to controls the large electric bells that louder than a general phone. This circuit is modified from the speaker protection circ > read more

IC regulator protector circuit when load short

09/09/2014 21:32:29 PM

Today I have a little idea is the ICs regulator protector circuit in a load short-circuit. We design for the 12 volts DC regulator only. For example: IC-7812, or others 12V power supplies. How it works Figure 1 is the circuit diagram In the circuit, > read more

200-360 watts class G MOSFET Power amplifier

09/09/2014 01:18:25 AM

This is the Class G MOSFET power amplifier which is high end for all your jobs. It have more feature, - maximum RMS output power: 200 watts at load 8 ohms or 360 watts at the load 4 ohms. - The frequency response range: 10Hz.-150kHz. - Minimum harmon > read more

TDA2822 stereo amplifier circuit with pcb

09/07/2014 10:38:20 AM

This circuit stereo power amplifier. By use integrated circuit number TDA2822 within be model Dual Amp give power watt at 1W +1W bandwidth expansion rates at 40dB 120kHz use power supply since 1.8V to 15volt and use current 6mA feed power supply 9vol > read more

How to increase currents of a transformer

09/06/2014 02:04:51 AM

If your the transformer too low current, until you cannot use fully it. It is a pity if you need buy the new transformer. So let’s look at how to modify it to increase current up. But the transformers must be the center trap type as Figure 1, s > read more

Simple 12 LED running using CD4017 and NE555

09/05/2014 08:48:59 AM

Here is a simple 12 LED running circuit that use CD4017 and NE555 as based of circuit. It like the two way 12 LED running lights using CD4017 and NE555. Which it use 12 LEDs only. There are a interated running form. To begin with LED flash from the c > read more

Automatic Reverse polarity switch by Relay.

09/04/2014 02:13:08 AM

This circuit is an automatic reverse polarity switch. If we apply DC voltage to a any electronic circuits in wrong polarity. It can be caused by too much current. You must waste time to reverse the new terminal. If your circuit is importance, letR > read more

Diode tester circuit using IC-741 and LED

09/02/2014 12:56:05 PM

This diode checker circuit can check the diode the good or bad and also can indicate its polarity. How it works In Figure 1, There are IC1, R1, R2, R3, C1 include as the oscillator circuit that generate the square wave out to pin 6. This signal will > read more

Low noise tape head preamplifier

08/31/2014 23:39:07 PM

This is a low noise tape head preamplifier that good sound quality. Because use LM387N that is the low noise ICs and is designed for the specific preamplifier. Figure 1 is Circuit diagram of this project. Maximum the output at 1 volts which is is hig > read more

Simple variable dc power supply 0-30V 2A for beginners

08/30/2014 06:18:13 AM

If you are beginners who want to use the simple variable DC power supply 0-30V 2A. This circuit is best for you. Because it has a few parts,small,and cheapest than others circuit that same power. The features of this handset is the DC voltage continu > read more

200 watts super bridge power amplifiers

08/28/2014 20:30:52 PM

This is a 200 watts super bridge power amplifiers, include the transistors as based of circuit, so suitable for signals from the bass guitar. It’s a high power, durable and cheap. Use it in the house, the sound quality also is good. In Figure 1 > read more

Active microphone preamplifier using LF356

08/26/2014 22:36:43 PM

This is an active microphone preamplifier circuit for the particular condenser microphone. Generally, the condenser microphone has high sensitivity and the high output signal more than the other types microphone, but this type need to have a power su > read more

LF356 JFET Input Operational Amplifiers

08/25/2014 23:04:08 PM

LF155/LF156/LF256/LF257/LF355/LF356/LF357 FET Input Operational Amplifiers These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET Tec > read more

AN6780-General Purpose Long Interval Timers

08/24/2014 03:03:23 AM

The AN6780 and AN6780S are ICs designed for general purpose long interval timers. They consists of an oscillator, frequency divider (flip-flop 15steps), output circuit, and power circuit. A cycle can be freely set with the external resistor (R T ) an > read more

2 transistors Microphone preamplifier

08/23/2014 09:50:43 AM

This is a simple microphone preamplifier circuit that use 2 transistors are connected in the direct coupling, to respond the signal even better. How it works In Figure 1 the circuit diagram On collector of Q2 will feedback signal to the emitter of Q1 > read more

Modify Acoustic into the electric guitar on FM wireless transmitter.

08/22/2014 08:58:16 AM

This circuit is used to Modify an Acoustic into the electric guitar on FM wireless transmitter system. It is small, cheap, easy to build. The acoustic guitar pickup of this circuit like working of the condenser microphone. Which is good because This > read more

LM380 2.5W Audio Power Amplifier

08/21/2014 00:41:03 AM

Many circuit use LM380 Why? and hot to use it. I find datasheet at NT is good ICs. below is short datasheet that you can use it on basic. The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain > read more

How to use normal multimeter to measure high AC current.

08/19/2014 02:10:08 AM

A general cheap analog multimeters will not have directly AC current ranges.  But we are an Electric Appliance Repair, will always have this problem. For example: Measuring current of the electric appliances. How to modify our meter? We can modify t > read more

The parts you need.

08/17/2014 23:00:50 PM

Now that I am older,bad memory. It is slow and may be faulty. Ancient people used to say that when do not remember, so must be noted protect to forgetting. Thus I will write this article to me. but not only me It may be useful to everyone. Switches S > read more

Logical guessing game circuit

08/17/2014 22:27:57 PM

This circuit is the logic guessing game circuit use the digital ICs as base of projects. They are used for playing, with 2 players, the first will set logic, and second guessing logic. The code in this circuit is 4 switches. If a player can guess the > read more

Low noise pre tone control circuit using NE55532

08/15/2014 01:14:08 AM

This circuit is a pre tone control using NE5532. In a three circuits of preamp tone controls by NE5532 is a very popular. But it has details are not clear. We recommend the low noise pre tone control circuit instead. We use the a NE5532 is heart of c > read more

6 ranges AC millivoltmeter circuits

08/14/2014 00:58:09 AM

Sometimes, we need to measure very tiny AC voltage and also high frequency. We cannot use a general meter. How it works This circuit can easily measure the very tiny AC voltage and high frequency 100 Hz to 500 Khz. Use an op-amp is the input is mosfe > read more

300 watt – 1200 watt MOSFET Amplifier for professionals only.

08/13/2014 02:35:15 AM

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. Note: Today I edit pcb layout to clear view. For t > read more

Idea to build simple frequency meter from old calculator

08/11/2014 20:11:32 PM

This circuit use a simple ideal is the calculator count a frequency within range 1 second. This time base is generated by IC-555,on astable multivibrator form. How it works The number on the calculator’s panel is the input frequency. to base of > read more

Modify a LED chaser circuit into the easy timer

08/08/2014 09:14:15 AM

The a LED chaser is popular, so we will modify it into the easy and cheap timer. First,a appliance will works, while respective LEDs will flash, and until all LEDs go out. Then the appliance stop. How it works. In Figure 1 is the circuit. To begin wi > read more

The light meter circuit using a general diode

08/06/2014 22:03:39 PM

This is a simple light meter circuit using normal diode as a sensor and show amount of light by a any voltmeter. The light can change the properties of many devices, example.. LDR as photo resistors can change resistance by light. Photodiode- like LD > read more

Modify AC Dimmer to automatic light switch controller

08/04/2014 13:55:26 PM

Way to modify an AC dimmer into a light switch circuit, to turn ON-OFF and automatic light dimmer or two in one form. Since, the general dimmer uses a triac to control a load like a relay contact. So we can easily make it by a few parts. The automati > read more

AC lights dimmer using triac

08/02/2014 07:10:46 AM

This circuit has can to turn down a light bulb arrives at 100W. If Triac there is tall temperature should hold Heat Sink or let off the heat. The Diac be diode that perform be formed encourage or Trigger Diode 2 kinds are way or Bidirectional. The VR > read more

Motor burn out and under voltage protection

07/29/2014 00:33:14 AM

This is AC motor burn out protection causes of under voltage input. The principle is simple, it will check for voltage at all times. Normal voltage is 220V AC. If the voltage falls below a preset. Relay will not work and the LED is a warning. Can be > read more

Simple sound effect generator circuit using IC-555 and IC-4017

07/26/2014 12:49:24 PM

If we want to be a producer,This circuit would be a good starting point to composed music for 1000 tracks. As Figure 1 is a common circuit. Which will see them always when use LED running. We will use an IC-555 timer and IC-4017 Decade Counter Divide > read more

Simple guitar fuzz effect circuit using IC-741

07/26/2014 03:02:26 AM

In play guitar or other instruments. Sometimes people just want to be a sound of unusual instruments, from some common. and this fuzz effect circuit or crack, it is the circuit that is commonly used characteristics as shown in Figure 1. How this circ > read more

Sound detector using LM324

07/25/2014 22:09:11 PM


Simple video amplifier using LM359

07/24/2014 07:26:58 AM

A video signal coming from the video player to connected to others video recorder or the video in of the TV. If we use a long cable to make the signal weaker. Thus, the strength or clarity of the signal is not performing well. We had to use a signal > read more

The Filter circuit for the Scratch and Rumble Noise

07/23/2014 21:04:42 PM

If a friend gets into trouble about the noise. Try out this circuit before, may like. It is Filter the Scratch and Rumble Noise Circuit. That make a friend feels annoyed very the character of the circuit filters this frequency , use , Resistor , and > read more

Band rejection filter circuit using TL071

07/23/2014 21:00:45 PM

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 d > read more

How to soldering is easy

07/23/2014 18:58:26 PM

Friends say that Electronic Project I presented is not working. But any project in The Our Electronics Projects Tested through the creation of me. Therefore guarantee that the It certainly worked. When I was a beginner. Most projects does not working > read more

65W Power Amplifier Class AB by LF351 ,TIP3055 and TIP2955

07/21/2014 22:01:53 PM

I like mini power amplifier less 100W because it is low cost nad easy to make project. The 65W Amplifier Class AB,I use main part electronics are IC LF351 and thansisror two part TIP3055 and TIP2955. The LF351 is a low cost high speed JFET input oper > read more

Power Amplifier OCL 70 watts using IC-741, 2N3055

07/21/2014 22:00:08 PM

Younger brothers and sisters a student takes an interest to build electronics project sends a teacher. I then choose this circuit , because build easy be valuable certainly. It is Main Power Amplifier Circuit 70Watt RMS sizes are model OCL Class AB. > read more

How to make a perfboard Prototyping

07/20/2014 22:52:35 PM

A Building various electronics project. The tedious process for me, and almost everyone is the creation PCB prototype form. If we make it difficult for yourself. If you want to order Single sheet It takes a long time. I will assemble the device to Pe > read more

The first my ebook.

07/19/2014 19:49:16 PM

I am a freelance writer, published a book through the publisher. Later I do not sent the manuscript to the publisher. I like to write articles on their own websites, A independent high. But I still love to write books all the time. Yesterday, a frien > read more

Adjustment DC power supply 1.25-15V Max current 0.5 amp

07/19/2014 01:34:49 AM

This is power supply that have Voltage output fine the value has 1.25-15V. From by Output current that be valuable about 0.5 amp that 12V and 0.2 amp that 15V. When Volt , from 220V houses reach transformer. It will modify Volt 220V to be 18VAC alrea > read more

2 Lamp flasher using Mosfet

07/18/2014 02:43:08 AM

we made a Simple flashing light by transistor BC548. It is easy circuit for LED display, but when need to use high watts bulbs or lamps will be extremely tricky. As this circuit We must add both transistors to increase current to load. Today I recomm > read more

Modify old battery charger into automatic using power SCR and CA723

07/17/2014 05:51:31 AM

This is how to modify old Lead-acid battery charger into automatic charger form. To protect battery over charging. We use simple circuit with comparator circuit by CA723 regulator and power SCR cut off current controller. The working principle As Fig > read more

Simple LED torch using single AA 1.5V Battery

07/16/2014 12:37:15 PM

Many people like this circuit It is surprising 1.5V battery can drive LED light, but some say that the circuit not work. Today I would like to introduce simple LED torch circuit which also use single AA 1.5V battery. But there are fewer parts. Such a > read more

The Our Electronics Projects Tested

07/16/2014 02:00:26 AM

Everyone need to build electronic projects certainly work.You do not want to waste time on a circuit that does not work well.It is easy To offer any electronic circuit on the internet.But it is difficult for presenting electronic circuit that really > read more

Class A headphone amplifier using TL072 low noise.

07/15/2014 03:30:47 AM

We will use a Class A stereo headphone amplifier that is very good quality sound. Consists a low noise Op Amp ICs and 2 transistor as main so have very cheap and easy to build. It can increase all audio source such as CD player, the AM, FM radio or o > read more

New my Smoke Absorber and helper

07/14/2014 10:06:32 AM

This is a new smoke absorber and helper which good quality and have a smoke filtration system. I was ever presented a them in “DIY Smoke Absorberand helping hand” which can create by myself, it works well, but bizarre shapes, and no filter. Durin > read more

Refrigerator Door Detector Alarm

07/13/2014 02:12:09 AM

This is a Refrigerator Door detector alarm, it will detect light of lamp in the fridge and alert with buzzer. This projects is small size, easy to make and cheapest. It will alarm when Small child secretly eating candy or medicine stored in the refri > read more

Over and Under voltage protection of electrical appliances

07/11/2014 23:22:15 PM

This is an over and under voltage protection to all electrical appliances are safe. We use electronics circuits, high accurate work is fast LM393, AN6780 and more. Which cut off currents with power relay. I’ve presented this way, it is Over & U > read more

12V battery to 5V 1500mA DC converter regulator

07/10/2014 21:24:19 PM

This is a 5V 1500mA DC regulator circuit. which is simple circuit using IC-7805 to fixed regulator 5 volts and TIP41-NPN power transistor to increase current up to 2A. Example experiment. I use the power supply for 12V battery. To reduce constant pre > read more

Boost converter 5V to 12V

07/09/2014 01:50:15 AM

This circuit offers a variety of Buck DC to DC converters. Because as circuit increase voltage of 5 volts to 12 volts. This circuit is called Boost converter circuit. The primary circuit is shown in Figure 1. According to primary circuit, when switch > read more

Guitar Preamp – over drive using 12AU7

07/08/2014 22:20:53 PM

This is a guitar booster for those with a love for music. act as preamplifier or over drive signal acts soft voice before to the power amplifier or headphones. Highlight is a very clear sound without noise. Because we use 12AU7 vacuum tubes is the ma > read more

How to resolve slowly Internet

07/06/2014 22:58:50 PM

If you have a slow Internet problems. When I open the page Photos show incomplete. This looks to be on all computers and all sites. I find the cause for a long time. At first thought Virus, but not because we are using ubuntu OS. When I touch a modem > read more

DIY simple 12v led light

07/04/2014 03:49:29 AM

A LED light bulb is being popularity more than a conventional light bulb. Because It has high efficiency, low power consumption and thus heat resistant. I buy the 12V LED Light Bulb as Figure 1 For use in cars And general use Figure 1 LED light bu > read more

Very simple preamplifiers using 2N3904

07/03/2014 22:19:30 PM

Hi, Friends. Today I get email from Kunal Banerjee, send a preamplifier projects to published for all to see. It is very simple preamplifier circuit using one 2N3904 transistor only. Though very small, but it still have many useful. He say it low no > read more

My site is attacked

07/03/2014 02:46:38 AM

Hi, Many Friends About a week ago, my site is slow so much that I can access and update the site. The admin said that DDOS attack of very severe until system can not. Now normally, However do not trust. For this reason, I have stopped updating thi > read more

Simple 1.2V AA battery Solar charger circuit

06/30/2014 03:16:53 AM

This is simple 1.2V AA battery Solar charger circuit. If you want to charge only one 1.5V AA battery and must used at outdoor that don’t has home electricity. We will also use fast it so we need to application devices near us. This projects is > read more

0-50V 3A Variable DC power supply

06/27/2014 01:30:41 AM

This regulator is circuit that adjust output voltage wide rage between 0-50V, and Also important is the overcurrent protection circuit at 3 Ampere. Which will immediately cut. The voltage regulation circuit because use IC-LM723 ICs will provide bette > read more

Low pass filter subwoofer using LM324

06/24/2014 10:21:03 AM

This is a low pass filter subwoofer using IC 324 and some other components. which is mr Kunal Banerjee sent to me to publish on our site.It is very useful Thank you very much The Schematic PCB LAYOUT ORIGINAL The PCB layout original PCB SILK ORIGINAL > read more

Two transistors fm wireless microphone circuit

06/24/2014 02:16:28 AM

This FM Wireless Microphone circuit Which adds a transistors in RF amplifier other one. So this circuit have two resonance circuits and also two trimmers. This cause have Higher efficiency And transmission far up. Technical information. Used DC P > read more

Rat and cockroach repeller circuit

06/21/2014 23:25:21 PM

This circuit is a rat and cockroach repeller which use principle of sound waves or ultrasonic cause they annoyed so it escaped away. This is small and cheap because use transistor (no ICs) and super loud since use large piezoelectric but use low curr > read more

Cricket voice with buzzer using LM324

06/18/2014 07:59:04 AM

This is a cricket voice circuit which is an another Sound effects generator byLM324 op-amp and emit by a buzzer. And they have sound similarly the crickets are singing a couple we've ever heard. In circuit we don't use any microcontroller ICs so you > read more

12V Battery charger using UJT

06/17/2014 10:08:09 AM

> read more

The most lead-acid battery charger circuit by LM317

06/17/2014 07:17:11 AM

When you want to build the lead-acid battery charger project for 6V battery or 12V. 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 fo > read more

The 4 sound effect using UM3561

06/16/2014 01:13:28 AM

Here is a 4 sound effect that use one IC-UM3561 and a few parts only. It can make siren, Ambulance sirens, Police car sirens, Fire truck siren and Space Machine Gun Sound effect How it does works As Figure 1 is the circuit diagram. To begin with > read more

AM simplify radio with earphone

06/12/2014 10:09:22 AM

This AM simplify radio with earphone is a saving version that use a few parts, cheap , easy to build and Suitable to be assembled to study. Technical information Use power supply of 3 Vdc. Maximum consumption current about 45 mA PCB size : 2.38 x 1.2 > read more

How to apply an inductor from the compact Fluorescent Light Bulb Burned Out

06/04/2014 11:06:30 AM

Hi Friends. In the present a small electronics invention. Most of these types of switching circuit. is… An Inductor (or coil) is one device To create problems for me To buy or use. But it is only simply a wire wound into a coil and usually arou > read more

High power 6 LED Flashlight for 1.5V AA battery.

06/03/2014 02:28:10 AM

This circuit look like a torch by use on 1.5V battery only so it can be used. Since small so Easy to carry in various places. And also very bright as well. The technical information Power supply : one 1.5V AA battery. Maximum current used 200mA Uses > read more

Simple Ni-Cad Charger for Solar Cell Radio by BD140

06/01/2014 01:33:25 AM

A solar cell radio used a 3V (or two 1.2V) Ni-Cad battery in it. The battery can not be removed. It use a mini jack socket for charging. Its quiet difficult to find such a voltage charger. Here is the circuit to convert the voltage from the general p > read more

© 2006-2014, All Rights Reserved