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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!
Optical Remote Switch
Using this optical remote control, you can switch on/off any electrical or electronic load. Like any remote control system, it has a mini transmitter unit and a receiver unit to activate the relay.
Infrared (IR) Illuminator
Infrared (IR) illuminators are widely used to improve the image-capturing quality of security cameras fitted in dark zones. Just like our eyes, cameras also...
Low-cost Intercom Circuit Using Transistors
This is a circuit for a low cost intercom that is made by using transistors.
Sound Operated Lamp Switch
This inexpensive, fully transistorised sound operated lamp switch is very sensitive to sound signals and turns on a lamp when you clap within 1.5...
Smart Battery Protector Using a Shunt Regulator
The life expectancy of a battery dramatically reduces when it is discharged below the minimum recommended battery voltage. You must disconnect the load before...
Infrared Toggle Switch
This infrared toggle switch can be controlled by any TV/VCR remote operating at 38kHz frequency. The circuit uses readily available, low-cost components and can be assembled on a small veroboard.
Simple HF Power Amplifier
Here is an inexpensive but powerful high frequency power amplifier for the 40m (7MHz) band. The circuit accepts only 20-30mW RF power and amplifies...
Teleconferencing System
This is a circuit for teleconferencing system that can be used to conference two telephone calls on two separate telephone lines.
Infrared Bug
This infrared bug circuit can be used to detect the presence of modulated infrared signals in its vicinity from any electronic source, for instance,...
Smart Vibration Sensor
Machines nowadays require optimum parametes to operate at their best. Some operating conditions concerns include themperature extremes, magnetic intereference, vibration & electromagnetic intereference among...
Electronic Ludo
In this electronic version, the players need to press a push-to-on switch instead of throwing the six-surface dice. When the switch is pressed momentarily, the 7-segment digital counter displays a number immediately.
Christmas Lights Using LEDs
This is a circuit that can be used as for festive decorations. It contains eighteen LEDs that can be assembled as one's wish.
Easy Transistor Tester
Using this easy transistor tester circuit, find out whether a given transistor is good or bad before soldering it. You can also identify npn...
USB Power Booster
The USB serial bus can be configured for connecting several peripheral devices to a single PC. It is more complex than RS232, but faster...
Accurate 1Hz Signal Generator
Accurate 1Hz squarewave pulses are required in stopwatches and other digital circuits. Here is a low-cost, general-purpose 1Hz signal generator without using a crystal oscillator.
Ultrasonic Burglar Alarm
This unique ultrasonic burglar alarm makes use of the invisible, inaudible ultrasonic sound beam to detect movements. Ultrasonic transducers operate at maximum efficiency when...
Low-cost Night Lamp
This simple, low-cost night lamp automatically activates at night and deactivates in the daytime. It incorporates battery charging circuit with protection against over-charging and deep-discharge.
Current Sensor
The circuit presented here senses the flow of electricity through the appliances and generate an audible beep after every fifteen minutes to indicate the ON state of device.