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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!
Logic high/low Indicator
This logic high/low indicator circuit comprises two ICs. One is hex inverter IC 7404 (IC1) and the other is a bistable multivibrator built around...
Simple Short-Wave Transmitter
This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½ Jgang condenser VC1, which determines the carrier frequency...
Simple Transistor Type and Lead Identifier
A bipolar junction transistor (BJT) has three regions, of which the emitter and the collector are made of the same type of semiconductor (‘n’...
Twinkle Twinkle X’mas Star
Christmas just would not be Christmas if you do not put a flashing star on your Christmas tree. Here is the circuit of such...
Picnic Lamp
You can take this white LED based night lamp on your picnic outings. The lamp has sound trigger and push-to-on facilities and gives ample...
FM Adaptor for Car Stereo
If your car has an FM radio with stereo output but no inbuilt cassette player, this circuit will come handy for listening to your...
DC-TO-DC Converter
Here’s a low-cost DC to DC converter circuit that converts 6V DC into 12V DC. It uses no transformer and is easy to construct...
MOSFET based Preamplifier for FM Radio DXing
FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal....
Non-Contact Power Monitor
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fusefailure or power breakdown...
Infrared Interruption Counter
Most optical interruption counters make use of a light bulb with light-dependent resistor (LDR) or ordinary phototransistor as the sensor. The interruption counter work...
Little Door Guard
If some intruder tries to open the door of your house, this circuit sounds an alarm to alert you against the attempted intrusion.
The circuit...
Power Failure And Resumption Alarm
This circuit gives audio-visual indication of the failure and resumption of mains power. The circuit is built around dual timer IC LM556. When mains...
Solar Bug
This Solar Bug circuit takes power from a small solar panel and then produces a sound in a buzzer momentarily when the relaxation oscillator...
Accurate Foot-Switch
Certain industrial controls require accurate switching operations. For example, in case of a foot-switch for precise drilling work, even a small error in switching...
Power-on Reminder with LED Lamp
Many a times equipment at workstations remain switched on unnoticed. In this situation, these may get damaged due to overheating. Here is an add-on...
Digital Audio/Video Input Selector
Need to connect more than one audio-video (AV) source to your colour television? Don’t worry, here’s an AV input expander for your TV. It...
Multiple Applications of High-Power LEDs
Nowadays, high-power light-emitting diodes (LEDs) LXHLMW1C are available in the market. These white LEDs contain indium-gallium-nitrogen (InGaN). The LEDs’ emitting capacity is 20 candela...
Pencell Charge Indicator
Small-size AA cells and button cells used in electronic devices providing a terminal voltage of 1.5V are normally rated at 500 mAh. As the...