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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!
Simple Automatic Water-Level Controller
Water level controllers are common nowadays. The automatic water level controller described here is built around a timer NE555 and inverter buffer CMOS IC...
DIY LED Chaser Circuit with Tune Generator Using NE555
IC1 (NE555) is used here as a clock generator. It is configured as an astable multivibrator whose frequency can be adjusted with the help...
SHORT WAVE TRANSMITTER
This transmitter circuit operates in shortwave HF band (6 MHz to15 MHz), and can be used for shortrange communication and for educational purposes.
The circuit...
Protect Your Appliances with This Over/Under Voltage Cut-Out Circuit
This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages.
The...
DIY 7MHz CW/AM QRP Transmitter Circuit
The circuit of a 7MHz C W / A M QRP transmitter described here can be used to transmit either CW or audio frequency...
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...