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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!
Milliohm Meter
Milliohm meter is used to check low resistance of connecting wires. It can deduce the resistance of thick wires, condition of contacts and the...
Door Ajar Alert
Have you ever accidentally left your front door ajar and had a pet or your little kid escape? Here is a smart solution to...
High-Resistance Meter
This resistance meter can measure resistances up to 200 mega-ohms. The value of the resistance is indicated on a linear meter scale (0-100 uA)....
TELEPHONE LINE IN-USE INDICATOR
This circuit gives a visual indication of whether a telephone line is in use or not, helping two or more people sharing the line...
RADIO/AUDIO FREQUENCY GENERATOR CUM BFO
This radio-cum-audio frequency signal generator can also be used as a beat frequency oscillator (BFO) for continuous-wave and single-sideband signals.
Fig. 1 shows the circuit...
Pull-Pin Security Alarm
Here is a simple and low-cost circuit of pull-pin security alarm. While travelling, rig the alarm unit to your luggage using a home-made security...
Electronic Electroscope
An electroscope is the instrument used to detect charged bodies. Here is an electronic version of the scope that is sensitive and, unlike conventional...
Nano-Ampere Meter
This circuit can measure currents down into the nano-ampere range. It is useful when building, testing and experimenting with low-power circuits, especially those operating...
BCD Frequency Meter
Here is a simple circuit that precisely measures the frequency in BCD format. The circuit is built around dual comparator LM393 (IC1), dual D-type...
8-bit Generator and Display For Microcontroller
For testing of microcontroller-based circuits, you need two test jigs: One for generating the desired bitstream to serve as the input to the device...
LASER-BASED INTRUDER ALARM
You can use this laser-based intruder alarm conveniently at the entrance of a hall or any other similar location to protect the same from...
AC MAINS BISTABLE SWITCH
This AC mains-operated bistable switch turns on or turns off a device using a miniature neon lamp and a few discrete components. This switch...
MOVIE MAKER
Like real movies, this circuit makes use of a characteristic of the human eye and brain known as the persistence of vision. A sequence...
MOTOR CONTROL THROUGH PWM
Motion control plays a vital role in industrial automation. It is required in manufacturing plants of industries like chemical, pharmaceutical, plastic and textile. And...
Call Bell With Welcome Indication
Here is a simple call bell circuit that displays a welcome message when somebody presses the call bell switch momentarily. The alphanumeric display can...
CASH BOX GUARD
Most thefts happen after midnight when people enter the second phase of sleep called 'paradoxical sleep.' Here is a smart security circuit for your...
Photovoltaic Battery Charge Controller
A charge controller is one of the main components of a solar battery charging system (Fig. 1). Its main function is to fully charge...
GUITAR EFFECT PEDAL POWER
A friend of mine plays guitar with several guitar effect pedals. He had a problem with battery eliminators and cables of the pedals cluttering...