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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!
Electronic Dog Whistle
A dog whistle is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but some other animals can,...
IC 555 Timer Tester
This simple and easy-to-use IC 555 timer tester not only tests the IC 555 timer in all its basic configurations but also tests the...
Acoustic/Mechanical Vibration Sensor
This circuit contains a piezoelement that detects any vibrations in the shutter of a shop and activates a lamp and a police tone alarm signal.
Zener Value Evaluator
Using this simple Zener value evaluator circuit and a known-value zener diode, you can find the breakdown voltage value of any zener diode. The...
Capacitor Evaluator
Using this circuit and a known-value capacitor, you can find out the value of any capacitor. This circuit can be divided into capacitor evaluator...
Desktop Power Supply
Useful for electronics hobbyists, this linear workbench/ desktop power supply converts a high input voltage (12V) from the SMPS of a PC into low...
Inexpensive Car Protection Unit
For car protection, custom made units are available but they are costly. Here’s an inexpensive car protection unit to protect car stereo, etc. from...
Noise Muting FM Receiver
The tuning of a frequency modulated (FM) receiver to a FM radio station frequency involves a lot of ‘hissing’ noise in between the stations,...
Doorbell cum Visitor Indicator
This doorbell cum visitor indicator circuit can also give identification of the visitor to your home in your absence. When you’re home, you can...
PC Temperature Alarm
This circuit uses a temperature sensor to detect the temperature inside the PC and generates an alarm if the temperature exceeds a pre-set limit.
Automatic Lighting Fence
This circuit can sense the movement of a person within the range of three metres from a fence and produce a tone from the buzzer. This is used as a security system.
Automatic Off Timer For CD Players
This is a circuit that initiates a timer for turning off CD player as soon as the bedroom light is turned off.
BODMAS Rule
BODMAS rule is an acronym to help children to remember the order of operations in calculations.. The term BODMAS stand for bracket, of, division,...
Electronic Door Key
This circuit is basically a short-range, infrared remote-controlled electromagnetic relay driver. It can be used to control door motors or solenoid-based locks using a compact and handy remote handset.
Light Operated Doorbell
Light-dependent switches are used in automatic hand-dryers and flushers in toilets. Here is a simple light-operated switch that works in normal light also. You can affix it on the main door of your house to work as an automatic doorbell or a thief alarm.
DIAC Controlled Flasher
This simple flasher finds various industrial applications as a high-voltage indicator or machine-’on’ indicator. It flashes once every second to give a warning indication. It is simple to design and can be wired lead-to-lead without using PCB.
Audible Continuity Tester
Here is a pretty simple, low-cost audible continuity tester that makes use of just one quad comparator IC LM339, some resistors and a piezobuzzer. The circuit including the comparator works off a single 9V battery.
Audible IR Proximity Detector
This circuit gives an audible indication when any object comes in front of the infrared reflecting sensor (containing IR LED and phototransistor). The sound generated by the sensor will be louder if the object close to the reflecting sensor is opaque.