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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!
Parallel-Port Controller Using MATLAB
Many projects have been published in EFY on how to program a PC’s parallel port using C, C++ and Visual Basic. Here we attempt...
Triple Mode Tone Generator
Here is a simple triple mode tone generator circuit that generates three different tones. You can use it as a call bell, burglar alarm...
Spy Ear
What binoculars do to improve your vision, this personal sound enhancer circuit does for listening. This light-weight spy ear gadget produces an adjustable gain...
Stereo Brick Amplifier
If you are looking for a compact and inexpensive add-on audio amplifier for your digital surround sound system or computer, then this subwoofer amplifier...
Green LED Flashlight with 555 Timer
Here is a simple green LED flashlight built around a 555 timer IC (IC1) and powered from a 3V battery pack.
Green LED-based flashlights are...
SMF Battery Guard
The emergency light is an automatic system in which a rechargeable battery-operated light source turns on as soon as the mains power fails. When...
Ball Speed Checker
This ball speed checker circuit measures the speed of a cricket ball based on the time taken by the ball to travel the distance...
Four Stage FM Transmitter
This four stage FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor...
Metal Detector Circuit Using Difference Resonator
Described here is a simple metal detector circuit that can detect metallic conductors in its vicinity up to a range of 25 to 30...
Digital Camera Adaptor
You need not be disappointed next time your digital camera shows low battery indication during a picnic trip. Just plug this digital camera adaptor...
Programmable Electronic Dice
Here’s a simple programmable electronic dice with numeric display. This dice can be programmed using a 4-way DIP switch to display any random number...
Electric Fly Swatter
None of us likes bugs at home. To kill these flying insects, they should first be attracted and then electrocuted. An electric fly swatter...
Remote Controlled Musical Bell
This is a circuit for a knock alarm that uses a piezoelectric plate to detects vibration due to knocking and activates an alarm for about ten seconds.
Electronic Combination Lock
This 7-digit combination lock can be easily hard-wired for any combination that you choose. The circuit uses a 4-bit, divide-by-8 Johnson counter (IC1), ten pushbutton switches and npn transistor T1
Three Phase Appliance Protector
Many of our costly appliances require three-phase AC supply for operation. Failure of any of the phases makes the appliance prone to erratic functioning...
Muscular Stimulator
Here is a circuit that stimulates nerves of that part of your body where electrodes are attached. It is useful to relieve headache and...
Room Sound Monitor
With this simple sound monitor circuit, you can secretly listen to conversations going on in a room. The circuit is very sensitive and powered...
Smart Hearing Aid
Normally, hearing aid circuits consume battery power continuously once they are switched on. The smart hearing aid circuit given here saves battery power by...