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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!
UPS FOR CORDLESS TELEPHONES
Cordless telephones are very popular nowadays. But they have a major drawback, i.e. they cannot be operated during power failure. Therefore usually another ordinary...
Telephone Security Circuit to Prevent Unauthorised Line Use
Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap misuse indications....
Intelligent Emergency Light Switch for Automatic Darkness Detection
This intelligent switch circuit enables automatic, switching on of an emergency light system during darkness in the event of mains failure. The mains power...
LOW CURRENT, HIGH VOLTAGE POWER SUPPLY
A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and...
DIY Telephone Call Meter Using Calculator and Quartz Clock Circuit
In this circuit, a simple calculator, in conjunction with a COB (chip-onboard) from an analogue quartz clock, is used to make a telephone call...
Connect Two Telephones in Parallel Without Interference
Often a need arises for connection of two telephone instruments in parallel to one line. But it creates quite a few problems in their...
Automatic Room Power Controller
An ordinary automatic room power control circuit has only one light sensor. So when a person enters,the room it gets one pulse and the...
TELEPHONE RINGER USING TIMER ICS
Using modulated rectangular waves of different time periods, the circuit presented here produces ringing tones similar to those produced by a telephone.
The circuit requires...
DIY Compact Telecom Headset Circuit for Hands-Free Communication
A compact, inexpensive and low component count telecom headset can be constructed using two readily available transistors and a few other electronic components. This...
Precision 1Hz clock Generator using Chip-On-Board
Usually the circuits for generation of 1Hz clock for applications in digital clock and counter circuits make use of ICs in conjunction with a...
Ultrasonic Proximity Detector
We the humans can hear sound of up to 20kHz frequency only. This proximity detector works at a frequency of 40 kHz. It uses...
Secret Bell
Many people move through the corridors and steps in multistoried buildings. As most of them are strangers for the inhabitants of the flats, it...
Build a High-Quality Dual Power Supply for Audio Amplifiers
High-quality audio amplifiers require a very efficient power supply with negligible ripple, hum and buzz. An ordinary bridge-type power supply has a drawback in...
Variable Power Supply Using a Fixed-Voltage Regulator IC
A voltage regulator (also called a ‘regulator’) with only three terminals appears to be a simple device, but it is in fact a very...
Telephone Operated Calling System
Dual-tone multiple-frequency (DTMF) receiver IC is commonly used in telephone equipment. One common DTMF receiver is Holtek HT9170 used in electronic communication circuits. The...
Friendly Charger for Mobile Phones
Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of...
Medium-Power FM Transmitter
The range of this FM transmitter is around 100 metres at 9V DC supply.
The circuit comprises three stages. The first stage is a microphone...
Micro-Power Flasher
With this micro-power flasher you can baffle the intruders trying to break into your home. The unit continuously emits flashing light both during day...