MEGA COLLECTION OF ELECTRONICS DIY PROJECTS
Every week, we publish 2 to 3 projects, sometimes even more! They range from simple circuits for beginners, to advanced projects that you can use to develop complete innovative products! Most projects have been developed by enthusiasts like you. Some by experts. And, some by our team. Many are tested at EFY Labs, and some are not–but they typically have a proof-of-concept video.
Mini UPS System
This mini ups circuit provides an uninterrupted power supply (UPS) to operate 12V, 9V and 5V DC-powered instruments at up to 1A current. The...
Duophone: Multiple Numbers Through One Telephone
This simple circuit of a duophone allows you to access two telephone lines through one telephone set. Each telephone conversation will remain entirely separate...
IR Based Light Control
This IR-based light control circuit turns on the lights at the portico, car parking or other areas when a motorbike or car enters through...
Motion Sensor for Security Light
Here is a motion sensor system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting...
Water Overflow Alarm
This water overflow alarm is built around two BC547 transistors and two 555 timer ICs
Generator Room Light
At night when power fails, one finds it difficult to reach the generator to start it. Here is the circuit for a generator room...
Photometer
An illuminance of 100 to 1000 lux is required for reading and doing close work without eye-strain. Specular illumination or bright sunlight provides 50,000...
Leakage and Continuity Tester
Here is a simple, chargeable leakage and continuity tester that can be operated in two modes: normal mode and gain mode. The gain mode...
Electronic Dice Using AT89C2051
This simple AT89C2051 based electronic dice circuit demonstrates the capability of an AT89C2051 microcontroller chip to function as a random number generator based on...
Pyroelectric Fire Alarm
Here is an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo element to detect fire. The lead zirconate titanate...
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...