Make Your Own FM Transmitter For Broadcasting
This FM transmitter design is one of the simplest you can build. No tuning is required, as the transmit frequency is crystal-locked at 90MHz....
Convert 12V DC To 9V DC Using IC LM2576
You may already have on hand a 12V AC/DC adaptor or 12V from your PC or 12V battery, but you need a 9V, 2.5A...
Automatic Water Refiller for Air-Coolers
Air-coolers provide cool air in a room by adding moisture to the air. This moist air is blown inside the room by an exhaust...
Build This Electronic Toy For A Child
Presented here is an electronic toy circuit for your child’s entertainment. The concept of a joint family is disappearing, and childcare is also becoming...
Make Your Own 15W Audio Amplifier
Here is a simple audio amplifier circuit based on TDA2050 IC. This amplifier can deliver an output power of around 15W for an 8-ohm...
Automatic Power-Resumption Alarm
Most power-resumption alarm devices produce non-stop alarm when power resumes. To overcome this problem, here is an automatic Power-Resumption alarm circuit that sounds an alarm...
Make This Solid-State Relay Driver for Microcontroller
Here is a simple solid-state relay (SSR) driver circuit using a transistor. An SSR is similar in operation to a traditional electromagnetic relay with...
Mini Fridge With Peltier Modules
It was in the middle of 1821 when J.T. Seebeck discovered that if two dissimilar metals connected at two different points are held at...
Smart Digital Calendar That Tells You Live News From EFY
We all must have used a photo frame in our houses, but have you ever wondered that you can make a smart digital photo...
Handy Tester
For beginners, here’s a low-cost multitester that can be used to test the condition of almost all the electronic components from resistors to ICs....
Make Your Own Portable Rain and Steam Detector
This is a simple portable rain and steam detector in one circuit. It is compact in size, runs on 9V battery and is easy...
Build Your Own Hi-Fi Stereo Audio Power Amplifier
Here is a simple hi-fi audio stereo power amplifier based on TDA2616 IC. This amplifier works on two 12V batteries or one ±12V AC/DC...
Control Four Appliances with a Touch Switch Panel
This project is based on a capacitive touch sensor for controlling four electrical appliances. Toggle switches have been used for operating lights or fans,...
HVDC Power Supply Design
Circuits like Geiger counters, insect zappers, Nixie tubes and sensors require high-voltage direct-current (HVDC) supplies. There are various types of HVDC power supply designs...
Meter To Measure Short Distances
This Arduino-based distance meter can be used for measuring the distance between the sensor and object in the range of 2cm to 400cm using...
LED Torchlight
Most commercial torchlights use three AA or AAA cells connected in series, which produces 4.5V to drive white LEDs using a current-limiting resistor. These...
Voltage Regulator as Audio Amplifier
LM338 voltage regulator can also be used as an audio amplifier. The output voltage can be controlled by varying the IC’s reference voltage (pin...
Minuscule LED Night Marker
The minuscule LED night marker presented here is an automatic light beacon that wakes up at night, or when there is not enough ambient...