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Engineering Projects For You

Free electronics projects, circuit diagrams and software codes available for students and hobbyists. Complete instructions on DIY electronic devices also available. These projects have been tested by EFY and are available with source codes. These are helpful with understanding concepts of electronics including basic components. The projects are designed to be helpful for engineering students and professionals building their own designs and circuits. The projects are also compiled from time to time to provide a single destination for project junkies. Let us know how you feel about the content and any thing you would like us to cover in the future. We hope you enjoy the content on this page!

Automatic Lamp Brightness Control Circuit

The circuit described here can be used for controlling a decorative lamp from zero intensity to maximum intensity in a specified time. Typical applications...

Simple High-Sensitivity Temperature Switch

This temperature switch has high sensitivity and is quite reliable. Here, in place of a single transistor, a Darlington pair has been used for...

CLAP SWITCH

Here’s a clap switch free from false triggering. To turn on/off any appliance, you just have to clap twice. The circuit changes its output...

Connect Two Telephones in Parallel with Intercom Functionality

The circuit presented here can be used for connecting two tele phones in parallel and also as a 2-line intercom. Usually a single telephone is...

DIY Bi-Colour LED Dancing Light Circuit with 555 Timer

The circuit as shown in the figure employs 14 bi-colour (red and green) LEDs having three terminals each. Different dancing colour patterns are produced...

DIY Extra Telephone Ringer with Visual and Audio Alerts

Many a times one needs an extra telephone ringer in an adjoining room to know if there is an incoming call. For example, if...

SONG NUMBER DISPLAY

Here’s a circuit to display the song number in an audio system for quick reference to songs. It also serves the purpose of an...

Build a DIY Electronic Lock System with Punched Cards and Relays

The circuit presented here can be used as a lock for important electronic/electrical appliances. When card is inserted inside its mechanism, depending upon the position...

Build a 1-Second Tone Generator Using UJT for Darkroom or Metronome Use

The timer circuit described here provides a pleasant musical tone in your darkroom at 1-second intervals.The circuit takes up very little space and can...

DIY Electronic Horn Circuit

Here’s a simple circuit of an electronic horn that is built around quadruple op-amp IC LM3900 (IC1). IC LM3900 has four independent op-amps (A1...

Teleremote Control

Here is a teleremote circuit which enables switching ‘on’ and ‘off’ of appliances through telephone lines. It can be used to switch appliances from...

SLEEP SWITCH CUM WAKE TIMER

Here is a sleep-switch circuit that can be easily converted into a wake-up timer. A dual-mode time setting makes the system versatile. The circuit...

CORDLESS PHONE BACKUP

Normally the base of a cordless phone has an adaptor and the handset has Ni-Cd cells for its operation. The base unit becomes inoperative...

PRECISION DIGITAL AC POWER CONTROLLER

Triacs and SCRs are extensively used in modern electronic power controllers—in which power is controlled by means of phase-angle variation of the conduction period....

Handy Zener Diode Tester

Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. The main advantage of this...

SMART PHONE LIGHT

The circuit shown here is used to switch on a lamp when the telephone rings, provided that the ambient light is insufficient. The circuit can...

CLAP REMOTE

An infra-red or wireless remote control has the disadvantage that the small, handy, remote (transmitter) is often misplaced. The sound operated switch has the...

CD-ROM DRIVE AS DIGITAL AUDIO CD-PLAYER

ACD-ROM drive can be used as a stand-alone unit for playing digital audio CDs without interfacing with a computer. The stereo output of CD...
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