Automatic Wiper Control Circuit

A continuosly working wiper is a big problem when it is raining slightly.The wiper control given here makes the wiper to sweep at rates fro...

Car subwoofer filter by TL072

Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automo...

Op Amp NOTCH Filter circuit

Operational amplifiers can be used to make notch filter circuits. Here we show two, a standard notch filter circuit, and another for a twin ...

USB sound card

Description. Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Tex...

Guitar and Bass Sustain Unit

We have all heard that wonderful sound of a guitar, where the note just hangs there seemingly forever (or at least until next Thursday).  S...

Power supply failure alarm

Most of the power supply failure indicator circuits need a separate power supply for themselves. But the alarm circuit presented here needs...

Negative Supply from single positive Supply

  Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in ...

Water Level Control

A Water detector is a small electronic device that is designed to detect the presence of water and alert humans in time to allow the p...

Air Ionizer

An air ionizer (or negative ion generator) is a device that uses high voltage to ionize (electrically charge) air molecules. N...

LC meter, Coil Capacitor meter

This LC meter circuit can measure coils and capacitors. When Lx or Cx is connected in the circuit the oscillator frequency will decrease and...

Electronic Fuse

Circuit of fuse (sekring) electronic designed to operate on 230V AC with an adjustable trip current. When the current through the load excee...

ONLINE ELECTRONIC CALCULATOR LINKS

  ONLINE ELECTRONIC CALCULATOR LINKS Amateur radio and audio calculators All Measure Measure, conversion table and calculators unit...

Color Sensor

Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours);...

SEX TRONICA

  If you are a fan of electronics, which is an exciting world that slowly gaining ground in my interest, I would like to try to build this c...

Digital Volume Control

This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls t...

Dual Pre-Amp and A/B Box Guitar Effect

The following circuit diagram is an electric guitar schematic of Dual Pre-Amp and A/B Box designed by Rick Barker:

Magnetic Gun

Picured in Figure 1 is a miniature magnetic gun. When optimally tuned, it will propel a small slug about 1.5 metres high, or 2.5 metres hor...

Ultrasonic Pest Repeller

It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can�t he...

Bar graph LED battery level indicator

This bar graph LED battery level indicator project is based on LM3914 monolithic IC from National Semiconductor that senses the voltage lev...

Ultra-Clean Power Supply

The schematic has been around on the net for a long time, thanks to Rick Barker. This is a great project and a great little unit to build. ...

22 Watts Mini Subwoofer Circuit TDA1516 with Adjustable Frequency

22 Watts Mini Subwoofer Circuit TDA1516 with Adjustable Frequency The subwoofer is a subwoofer or a apostle to carbon low frequencies, addi...

Function Generator Circuit

Description. The ICL8038 is a function generator chip, able of generating triangular, square , sine, pulse and sawtooth waveforms . Fr...

LED based transistor tester

Description. Here is the circuit of a very simple transistor tester which used two LEDs for displaying the condition of a transistor. Bot...

Scoring game circuit

Description. A simple scoring game circuit that can be used for all occasions when a dice is needed.The circuit is based on a NE555 time...

Digital code lock

Description. This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual fl...

FM Radio jammer

Description. Circuit shown here can be used to jam FM radios in its vicinity. The circuit is nothing but a classic single transistor oscil...

Combination Lock

D-type bistables can easily be used to make a combination lock . Using two 4013 integrated circuits, you can make a 4-digit combination loc...

Infra Red Remote Control Tester

The circuit is very effective to test the remote controls what still works or not, the remote record will be tested using infra red. Example...

Anti-Theft Car Audio Security

This small circuit uses a popular CMOS NAND gate CD4093 can be effectively used for protecting your expensive car audio system again theft,...

GSM phone ring detection

This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) b...

Cell phone jammer

A beautiful mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobile...

Cellphone Scanner

Here is a device to locate the mobile phone. It emits intermittent flashes and beeps to indicate the presence of an active mobile phone. The...

Home Intercom system

In this intercom schematic, the 8 ohm speakers is used as microphone and listening speaker. The 10K potentiometer controls volume and the ...

Ultrasonic pest repeller

There are many ultrasonic pest repellers available on the market but a major drawback is that their power output is low and their effective...