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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!
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...
A Fourth-Order Speech Filter (Based on Texas Instruments Application Note)
Human speech generally occupies an audio spectrum of 300 to 3400 Hz. There is a requirement, especially in telephone circuits, to limit the frequency...
Hearing Aid
This low-cost, general-purpose electronic hearing aid works off 3V DC (2x1.5V battery).
In this circuit, transistor T1 and associated components form the audio signal preamplifier...
Remote-Controlled Fan Regulator
Using this circuit, you can change the speed of the fan from your couch or bed. Infrared receiver module TSOP1738 is used to receive...
Briefcase Alarm
This miniature alarm unit protects your valuables from theft by sounding an alarm when somebody attempts to pick up your briefcase. It is a...
DTMF Receiver IC MT8870 Tester
Today, most telephone equipment use a DTMF receiver IC. One common DTMF receiver IC is the Motorola MT8870 that is widely used in electronic...
Farmhouse Lantern-Cum-Flasher
This circuit uses a dual op-amp IC LM358 and two transistors. It can be powered by a 6V maintenance-free rechargeable battery or a lead-acid...