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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!
Twi-light using white LEDs
This sunlight-controlled lamp uses a light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate resistors are connected...
HDD Selector Switch
Using the switch-mode power supply (SMPS) of your personal computer, this add-on circuit lets you switch between three hard disk drives (HDDs) and also...
Timer for Mosquito Destroyer
In electric-heating mosquito repellents, an electric vaporiser heats up a mat or liquid to release non-degrading chemicals into the air and keep the mosquitoes...
Pushbutton Control For Single-Phase Appliances
This circuit lets you switch off and switch on a single-phase appliance using two separate push switches. Such an arrangement is common for industrial...
Doorbell-controlled Security Switch
One way to check whether anybody is at home is to ring the doorbell. Burglars too use this very technique. The circuit described here...
ELECTRONIC CANDLES
Here is a simple circuit that can produce the effect of candle light in a normal electric bulb. A candle light, as we all...
TELEPHONE CALL RECORDER
Today telephone has become an integral part of our lives. It is the most widely used communication device in the world. Owing to its...
Smart Loop Burglar Alarm
Simple loop burglar alarms sound whenever the loop breaks. What if a clever thief comes to know of the working of this alarm? He...
CAR-REVERSING HORN WITH FLASHER
Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (refer Fig. 1) employs...
Stereo Headphone Amplifier
Here is an inexpensive circuit for a stereo amplifier to drive a low-impedance headphone set. The circuit uses a few cheap transistors (BC547 and...
Whisker for Robots
Whiskers for robots are simple switch-type sensors that work like an animal’s whiskers detecting nearby objects in the environment. When disturbed, the sensor sends...
TRANSISTORISED LOGIC PROBE FOR TTL
A logic probe is a handheld pen-like probe used for analysing and troubleshooting the logical states '0' or '1' of a digital circuit. While...
INVERTER FOR SOLDERING IRON
Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) in the absence of mains supply. It uses...
MULTI-SWITCH DOORBELL WITH INDICATORS
Here’s the circuit of a multi-switch input musical doorbell (shown in Fig.1). The circuit is built around the popular and less expensive quad D-latch...
KNOCK ALARM
This circuit (Fig. 1), used in conjunction with a thin piezoelectric plate,senses the vibration generated on knocking a surface (such as a door or...
Night Lamps
Here are two night lamp circuits using LEDs. One could be used as a night-vision clock and the other as a TV lamp. Both...
Musical Water Shower
Won’t it be nice to have music playing in the background all the while when you take a shower? This simple circuit does the...
Traffic Baton
In small towns, there are no traffic lights and the police regulate the traffic with hand signals. Since their hand signals may not be...