MEGA COLLECTION OF ELECTRONICS DIY PROJECTS
Every week, we publish 2 to 3 projects, sometimes even more! They range from simple circuits for beginners, to advanced projects that you can use to develop complete innovative products! Most projects have been developed by enthusiasts like you. Some by experts. And, some by our team. Many are tested at EFY Labs, and some are not–but they typically have a proof-of-concept video.
Over-Temperature Alarm
This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. It can also be...
Simple Alert Timer
This timer is a useful device for people who often forget to turn off devices in time. Suppose you want to boil water in...
Sound Sensor Alarm
This 6V battery-operated circuit triggers an acoustic piezobuzzer when a sound is detected. It can also be used as a cheap acoustic-type glass break...
Office Monitoring System
This system can be used in offices or hotels to call an attendant from seven different locations. The circuit provides audio indication of the...
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...