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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!
Infrared Proximity Detector
This infrared proximity detector using an infrared detector can be used in various equipment like automatic door openers and burglar alarms. Check it out...
Simple Soldering Iron Temperature Regulator
Soldering irons are available in different wattage and usually run at 230V AC mains. However, these have no temperature control. Low-voltage soldering irons (e.g.,...
Tachometer
Non-Contact Type Digital Tachometer
Low-Cost Tachometer
Simple Tachometer
DIY Tachometer built with a Microcontroller.
The article was originally published in December 2010...
Auto Reset Proximity Detector
Electrochemical processes taking place in our body generate complex signals (hum) that are continuously being passed along the nerve fibres throughout the body. Any...
Long-Range IR Transmitter
Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design a long range IR...
Telephone Receiver
Ever wondered how the old telephones used to work? find out here. This is a circuit for a telephone receiver without a dialling section. It consists of a ringing section and a condenser mic.
Power Suppy Failure Alarm
The power supply failure alarm circuit presented here needs no additional supply source as it employs an electrolytic capacitor to store adequate charge...
Mobile Phone Battery Charger
Mobile phone charger available in the market are quite expensive. The circuit presented here comes as a low cost alternative to charge mobile telephones/battery...
LED Based Reading Lamp
This LED based reading lamp circuit uses ultra-bright white LEDs to provide sufficient light for reading while consuming approximately 3 watts of power. In the case of AC mains failure, the battery backup circuit instantly lights up the LEDs.
Experimental Study of Switched Capacitor Circuit
In recent years switched capacitor circuit has gained popularity due to their suitability in integrated circuits.
The two major problems faced by IC designers are:
1....
Anti Bag Snatching Alarm
Here is a simple anti bag snatching alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or...
Dual Audio Signal Tracer
The circuit described here is of a dual audio signal tracer. An audio signal tracer is a simple device used to troubleshoot for audio...
Automatic Bathroom Light with Back-up Lamp
Sometimes we forget to switch off the bathroom light and it remains on unnoticed for long periods. This automatic bathroom light circuit solves the...
Simple Digital Security System
You can use this simple and reliable digital security system as a watch dog by installing the sensing loops around your building. You have...
Remote Controlled Power-Off Switch
The remote controlled power-off switch circuit given here can disconnect the entire system from mains using the remote for the audio or video systems. This circuit uses a remote control to switch off electrical appliances by the help of a infrared receiver module.
Mains Supply Failure Alarm
When ever AC mains supply fails, this mains supply failure alarm circuit alerts you by sounding an alarm. It also provides a backup light...
Touch Free Timer Switch
This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example,...
PIN Diode Based Fire Sensor
Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the...