How to make simple electronic buzzer

A electronic buzzer is simple. But useful well worth and the price is lower than 1$. By use just a 9-volts battery only. So withou..

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How to make simple electronic buzzer

04/21/2014 10:22:59 AM

A electronic buzzer is simple. But useful well worth and the price is lower than 1$. By use just a 9-volts battery only. So without worrying about electrical leakage or electric shock from 220V to buzzer. Unless also has LED will glow. Show that the

Automatic night light switch using 741 op-amp.

04/21/2014 02:57:38 AM

We’ve watched a lot of Automatic night light switch circuits. Which I like to use a transistor as base. But now we lets to see IC-op-amp. It is also very simple. As my feelings It has high sensitivity more than one, and with great high accuracy

Simple Two digits counter using CD4026

04/19/2014 01:33:45 AM

This is a simple two digit counter using CD4026 as main parts can display with LED 7 segment 0-99 number There is a reset button to restart. It can be applied to, for example, counting products, counting people into the library, and more. The working

Morning alarm with sunlight using IC-4011

04/17/2014 03:28:02 AM

This is simple circuit that we makes in hobby time or toys for my son but really uses. It will have sound alarm when morning like a normal clock alarm with lighting sensor same clock. We use a IC-4011 CMOS only one and a few components also can gener

Simple Electronic clock sound using IC4011

04/17/2014 01:07:57 AM

The sound of insects such as crickets, cicadas, resulting from flutter briefly. We can use a multivibrator to connects as sound generator circuit to imitate these insects sound. Some electronic clock alarm tone also sounds similar to these insects. A

Simple Tone Generator using inverter logic form.

04/15/2014 23:22:37 PM

We use a simple oscillator circuit in very many projects. I like to use a inverter logic gate since it is easy and cheap. But we do not use it directly. Mostly I use IC4011 nand gates since includes for separate four positive logic nand gate on a sin

20 Electronic Projects # 1

04/11/2014 01:49:36 AM

Now I am Electronic projects circuits blogger. It is hard work and dedicated time. We certainly need an income families. Many years ago, I had main revenue from adsense. Now the sponsor is ads banner And a commission from amazon I am so thankful all

Dual LED Flasher by 2N2907

04/09/2014 04:07:59 AM

This circuit calls more Free Running Multivibrator work resemble Flip Flop. Which encourage itself repeatedly. The Q1 and Q2 be Transistor PNP be usable general (2N3906,2N2907, etc.) The R1 and R2 limit current that flow through LED the bilateral. If

220 volts power inverter using NE555 and MOSFET

04/08/2014 23:11:22 PM

Today I want to show you a 220 volts power inverter circuit. Which it is easy and small size. Because use NE555 and MOSFET as main. This circuit I experiment it work well,When use source is 12V battery will have output of 100 watts. The principle of

1.5V LED flasher using BC556 and BC546

04/07/2014 02:19:37 AM

This is a low voltage LED flasher with 1.5V using BC556 and BC546 transistors. And other electronic devices is 4 resistor and 3 capacitors only. When about 15 years ago, making the LED flasher easy. because I use IC-LM3909 with an external device, on

Non contact ac detector voltage tester using CD4060

04/06/2014 03:00:04 AM

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 electri

Adjustable AC voltage power supply, 0-30V 3A

04/05/2014 02:22:33 AM

When we experiment a AC power. We always use power transformer as source but it cannot adjust voltage though it have a adjustable form but them too expensive. This project so may a good way of us. This is an Adjustable AC voltage power supply that ap

DIY AC 220V Power Strip for my electronic work bench.

04/04/2014 03:08:16 AM

DIY AC 220V Power Strip for my electronic work bench. In experiment an electronic project that use AC-line as power source. When we turns on-off load or the project. I always remove AC plug input. But it does not convenient and very slow when happens

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

04/03/2014 04:30:47 AM

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

1.2V-25V at 3Amp Adjustable Regulators using LM350T

04/02/2014 00:15:28 AM

This is a 3A adjustable regulators using IC-LM350T that look like In My first Variable DC Power Supply, but this high current higher than 3-Amp. Therefore they cause you can supply more any load circuit. Which we can buy this IC at many store but exp

Simple baby automatic night light.

04/01/2014 01:39:17 AM

My daughter is about 1 year old, normal to wake request milk. Several times a night. So to turn on lighting up the night. Causing inconvenience And uneconomical. We are thinking to buy a baby night light to replace normal lamp instead. By lower light

Very simple 50 watt inverter using MJ2955

03/29/2014 10:47:13 AM

Today I need to use AC lamp and Soldering iron at outdoor which no 220V AC electrical current. My friend borrow the 150 watt inverter of me, which I used it in car. It does works so well. So I not have any inverter. Therefore I need to build new inve

Simple auto cut off 12V battery charger

03/27/2014 23:29:13 PM

A lead-acid battery charger is most popular though it will very large size than others battery type. But them have advantage are : cheap, easy to buy and long life if correctly uses. The charging is best importance. When I had 10 year old ago. My fat

Diy digital voltmeter panel meter 0-50V

03/27/2014 02:35:01 AM

Friends interested The cheap digital voltmeter using CA3162 and CA3161 very much. But cannot buy ICs since it is very ancient. Now there is digital voltmeter panel meter that easy to use as Figure 1 is 0-50V scale. Display with LED 7 segment. In cost

American & Hong Kong police siren

03/25/2014 01:51:42 AM

Today I suggest siren circuit. Another circuit is very interesting. It can mimic the sound of a American police car and Hong Kong police. By which we use transistors mainly. For is so easy to buy equipment and budget. How does it work. In a Figure 1

Simple Ni-cad battery charger with little parts

03/25/2014 01:49:10 AM

Nicad battery as the battery is good. Commonly used. If you do not have a battery charger. I recommend this circuit. It is suitable for beginners. But still works great. Charging batteries are commonly used in the circuit because it’s cheap. Be

Simple SCR tester.

03/23/2014 02:13:26 AM

As usual, we can check a SCR with a plain multimeter. But it is not easy. This circuit is very useful. We can know the location pin on the gate lead, anode lead and cathode lead. And can also test diode, LED and Triac. The SCR devices kind, when take

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

03/22/2014 08:00:02 AM

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. New update Please read below this article. This is the First DC power supply in my lif

Infrared switch is controlled by a TV remote.

03/21/2014 02:02:47 AM

Nowadays Appliances used to control almost any function with remote control. But can not put the remote to control other electrical appliances. We can do this project With the following - Can be used with almost any infrared remote. - Can choose to w

Simple high level water alarm

03/19/2014 00:20:03 AM

This is a simple high level water alarm circuit diagram which we need to build it since: Outdoor fish pond The water level will drop rapidly. We need to check the water level regularly. The water had to be done very carefully. Should not be too hard

Battery voltage monitor circuit by LM339

03/16/2014 02:06:36 AM

This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which this circuit is used to check voltage of 9-volts battery. Description We use a LM339 Quad C

Nicad and NiMH Battery Charger by IC LM317T

03/13/2014 12:01:28 PM

Here is circuit diagram of the Nicad Battery Charger. It use IC LM317T ( Hot IC) Control Current less 300mA, Size battery 2.4V,4.8V,9.6V.It Low cost circuit. This is a NiCAD battery charger circuit. High-quality, Not necessary to have a full charge a

Two way 12 LED running lights using CD4017 and NE555

03/13/2014 04:17:52 AM

This Two way LED running lights to use for beautiful, this circuit uses 12 LED lamps, arranged in 2 rows, each row of 6 leds. A green one and a red one, alternatively. use a different color for this. Technical information -The power supply of 6-12 VD

5 channel graphic equalizer by BC548 transistor

03/12/2014 01:47:39 AM

Micro Inverter using TIP41 or 2N6121

03/11/2014 01:40:55 AM

This is Micro inverter or The inverter very small-sized, perform modify from the energy battery the small-sized , have the value voltage about 220V AC Volt 50HZ. By the circuit composes 2 transistors performs pulse oscillator generator or Square wave

Power supply regulator +15V -15V 1A by IC 7815 & 7915

03/10/2014 04:54:02 AM

ECG simulator using CD4521 and CD4017

03/08/2014 19:27:20 PM

ECG is very useful in the medical community. Such as experimental research and development of bio-medical imaging. But this should not be taken with patients because we do not want that. The real purpose is that it is used to preview a heart rate onl

LED Chaser by IC 4017 + IC 555

03/08/2014 07:50:07 AM

If you want to build a 10 LED Chaser circuit we suggest this circuit first. It uses popular IC is a simple and affordable IC-4017_decade counter and IC-555. As Figure 1 is LED chaser circuit whicn The CD4017 act as LED driver in 10 output, by LED wil

Many Logic probe circuit ideas.

03/08/2014 06:33:11 AM

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

10 LED roulette with TC4011-LM4017

03/08/2014 06:15:49 AM

If you get the job From teaching science to electronics projects. Elementary education level. This project is right. Is the LED roulette circuits. They uses the principles of digital ICs.Create an integrated LED flashing to the rhythm. And then stopp

The screen protector for glass LCD laptop.

03/06/2014 00:55:26 AM

Now A laptop computer has a LCD screen is glass panels. Which have high colorfully and contrast.The disadvantage is reflected into our eyes. So annoying. New Asus laptop AC-400 of me same them. I solved the problem by installing a screen protector. A

Automatic led night light switch

03/05/2014 08:00:54 AM

This is the night lighting system with LED display, and from battery power. Because the house is not convenient plug So the charging system with a solar cell. Moderately convenient to use. At night, the LED lights up and LED daytime off and electrici

CD4069 inverter gate circuit

03/02/2014 23:24:33 PM

A CD4069 consists of six inverter gate circuit in 14 DIP packets. It is made with CMOS technology so can be use on wide supply voltage range : 3.0volts to 15volts,low power consumption, high noise immunity: 0.45Vdd typ. And Low power TTL compatibilit

New projects and update : Sat 01 Feb 2014

03/01/2014 02:47:53 AM

LM383 is Linear 7-watts Audio Power Amplifier in TO-220 package. The tweeter speaker protection circuit Three led flasher by 3 transistor astable multivibrator How to modify adapter for philips Electric shaver More Email Before New projects and updat

LM383 is Linear 7-watts Audio Power Amplifier in TO-220 package.

02/26/2014 03:59:31 AM

It is a high power amplifiers suited for automotive application or many car systems. (14.4-volts supply) and use high current capability of 3.5-amps. It is current limited and thermally protected. Connection diagram The Features - High peak current c

The tweeter speaker protection circuit

02/24/2014 14:23:09 PM

This is The small tweeter speaker protection circuit It can be packed into any speaker cabinet, and does not require a power supply as well. Normally high powered audio system. Internal circuitry prevents speaker damage with always packed.It focuses

Three led flasher by 3 transistor astable multivibrator

02/20/2014 10:40:21 AM

We used the two LED flasher with transistors only. Today we come to experiment the three LED flasher as Figure 1 that also used astable mutivibrator with three transistors. They are used to drive all LEDs. The Flash rate of LED1-LED3 in each frequenc

How to modify adapter for philips Electric shaver

02/16/2014 21:19:28 PM

Almost every man has a mustache And when necessary to shave. When I was young, I used a razor because it’s cheap, but it’s not economical for daily use. So I buy a philips Electric shaver, it cost 15$ for 20 years ago. Figure 1 The philip

Jumbo digital clock using simple CMOS ICs

02/15/2014 21:51:11 PM

This is a Digital clock large size: 6 CM, cause can see clear on Very clearly in the range of 10 meters, even in the dark, because the display is easy to read numbers. This projects use all CMOS ICs that easy to buy in store than the Cheap Digital ti

CD4013 Dual D-type Flip-flops datasheet

02/12/2014 04:08:27 AM

The CD4013 or IC-4013 is a CMOS logic chip with two D-Type (DATA) Flip-flops. A clock pulse flow to C (clock pin), will store the data at the D input. Connect clock and a both Q output to make a toggle flip-flop for counting. For example use them:1HZ

Infrared Remote control 50 feet 2 Channel

02/09/2014 21:48:37 PM

This infrared remote control can control working of 2 channel or can use to control two Electric appliance, each one on-off freely and a maximum of 300 watts on Control distance is 50 feet. How does it work. We will describes the operation of this pr

CD4017 CMOS-Decade counter/divider

02/07/2014 02:26:34 AM

CD4017 CMOS-Decade counter/divider When we build the 10 LEDs running light for hobby. Often use CD4017 CMOS-IC. This really neat chip contains a counter and a decoder circuit, that can show a single output pin for each count from 0 to 9. And also use

Daylight sensor switch circuit.

02/05/2014 08:20:11 AM

My wife would like to control an Air pump (looked like this projects), to works only daylight hours. To save electricity and help extend the use of the air pump. I so select a light switch controller Because there are less devices and easily build. W

Drive relay by digital circuit

02/02/2014 19:48:55 PM

Use an output pulse from a digital circuit to controls transistor ON and drive the relay as switch ON-OFF to any circuits or external devices. The Controlling electronic circuits, Electrical devices in homes or factories. We often use the relay It is

DIY Circular Saw table

01/31/2014 22:25:42 PM

Woodworking is an activity that I enjoy very much. The secondary from the electronics. But I did not study directly. So View from youtube mainly. Wood cutting is very important. If it does not cut straight or 90 degrees. When assembly is a piece of w

Cheap Rechargeable 12V 7AH Battery

01/31/2014 08:31:08 AM

Today I login my affiliate-program.amazon.com see some order good for everyone. “Rechargeable 12V 7AH Sealed Battery” List Price: $54.90 Now Price: $9.81 You Save: $45.09 (82%) It very cheap battery for make many projects. Normally batter

The logic gate without IC

01/30/2014 20:06:07 PM

The past, we’ve used only a digital logic circuit by IC. But, in truth. We do not need any Ics, may use Switch or Diode or transistors connected as a logic circuit. Try to see Figure 1 which use switch and diode connected as AND and OR gate , T

The experiment touch switch using JK-flip-flop as RS-flip flop.

01/28/2014 06:24:17 AM

In the previous circuit, we use JK-flip-flop in as RS-FF. We will use pin R and S of flip-flops, by stores data of pin J, K and CK(clock). The experiment about the touch switch just to use your finger to touch them only also can turns ON-OFF circuit,

Adding width of my old electronics workbench desk

01/28/2014 06:19:08 AM

An electronics workbench desk is very necessary. I inherited from my father, are the old desk about the age for 40 year. I like it a lot and binding,it is still in good condition. But it has little to wide for me. (Compared to a typical computer) Fig

Slacko Puppy Linux on Lenovo Thinkpad X100e(no hard disk)

01/24/2014 23:16:45 PM

I used a lenovo thinkpad x100e, Long enough approx for 3 year. I like it because small size but so heat and not long time battery. Now it not have a hard disk because It is damaged and I no money for buy it. But I have main laptop for use every days.

Car forgot turn off headlights alarm

01/23/2014 17:09:09 PM

If we forget to turn off the lights in the car or headlights on all night but in the morning you could not even start the car Because batteries lose some voltage, we lets to build the warning forgot off lights circuit better. As perfect circuit in Fi

Light switch using JK-Flip-Flop

01/21/2014 17:19:16 PM

We try to apply a JK Flip-Flop to simple light switch experiment. We use MC14027 or CD4027 or TC4027 as CMOS-IC that inside has JK-Flip-Flop, and 16 pins. Which each pins difference acts as show in Figure 1 As left section,first include of pin 1 to p

DIY storage for the electronics hand tools

01/18/2014 09:09:10 AM

The Electronic Workbench has many electronic hand tools. My wife mutter too much, Because my the electronic desk that clutter with them. We should have the good storage system, making we can use them easily and nice and tidy. So she volunteer to make

FET Constant current drivers for LED display using BF256

01/16/2014 18:21:24 PM

This is a Constant current drivers circuit for drive LED display which can use FET-BF256 instead resistor so well. Normally when you use LED display in any circuits often use a resistor for limit LED current. Because easy and cheap. But it is not bes

Universal plug for turn on-off soldering iron.

01/15/2014 23:49:44 PM

A soldering iron is an important tool of electronic professionals. Normally we always to plug it forever. Even when not in use, so ready to use any time. Because of its low power consumption is only 20 watts. But when the youngest daughter was 2 year

The telephone line status indicator

01/14/2014 06:34:05 AM

This is a telephone line status indicator to prevent the hearing others talk on the phone accidentally and a Protection to making phone calls simultaneously. The telephone is a communication device that enables to communicate to each other, although

Small shelves on my desk for electronic parts store.

01/12/2014 22:00:22 PM

My wife complains about my desk very cluttered as many electronic devices She can not tolerate, so wear spirits as a genius carpenter. To make the Small shelves on my desk to me. To store too many electronic parts store. We must tell them that We are

The stray magnetic fields meter.

01/12/2014 01:53:40 AM

Electronic technology is common. Although it has much useful. But it is a kind of environmental pollution. Which is called “Electomog” or we will called Stray Magnetic fields (SMFs). And, Some experts said that “SMFs” has effe

The experiment use inverter gate as oscillator circuit.

01/11/2014 21:57:24 PM

The experiment use inverter gate as oscillator circuit. We will try to take an inverter gate to test fun circuit. The inverter that use is CMOS also be use the number : MC14069B. Or if not have used the old NAND gate : MC14011B. Then, take input join

5-volts DC regulator for portable MP3 player on motorbike

01/09/2014 23:08:58 PM

Motorbike repairman came to my house. Said, you know the story of how I like to build various electronics projects are always. And Talk to exchange knowledge with each other. During this time, he had been installed the stereo in a motorcycle. Can tur

30W-simple inverter using 6 transistors.

01/08/2014 15:17:32 PM

This is small inverter on 30 watts, It converts DC voltage from 12V battery to AC 220V-230V at 50Hz which is electricity same use in your house. It can provide 2-3 Air pump or other. You will like them because so cheap and easy to builds. The Air Pum

Tiny 30 watts OTL amplifier using LM1875

01/02/2014 23:24:01 PM

If you need to have a high power amplifier in small size. I suggest this project , It have powered drive output up 30 watts, by low noise and Low distortion. And easy to bulid because use a few devices. But is good sound energy worth the cheaper. The

Adding voltage rang for old multimeter

12/31/2013 21:11:15 PM

A cheap old multimeter as Figure 1 have very useful. But a its voltage range is so long cause see not clear such as the 2.5V range then away to 10V and then go to 50V range, it makes we can not read thoroughly. Figure 1 the cheap old multimeter that

Basic how to use H-bridge motor driver using bipolar transistor

12/29/2013 07:29:59 AM

A DC motor controller have many form, which is difficulty – easy to differently. Today, suggest building a simple two way DC motor control circuit. It is a H-Bridge that many popular and have high performance. That H-Bridge circuit, we will see

Adjustable dc voltage regulator circuit using ic-7805

12/20/2013 01:29:41 AM

I used to introduce many projects that use a IC-7805 or 78xx types, Today, it will modify from old circuit, IC-78xx series has many numbers. We can choose the desired voltage. such as “12V” should use IC-7812, but sometimes we don’t have th

Simple one shot Touch Switch using IC4011

12/18/2013 01:27:41 AM

Today we lets to play simple digital circuit. It is an One shot touch switch control. I use IC-4011 digital cmos is base of circuit. It is set form as flip-flops. The Logic “HI” at output when Your finger touch pad and is time delay for 3

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