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Beginners Projects

How to Play With Light Using LDR

In electronics, there are many ways to play with light the way you dream. If you are looking for an inexpensive solution, regular light-dependent...

Add-on USB Power Circuit For UPS

Most computer UPS have only 230V output and no USB output. Presented here is a USB power circuit that gives 5V USB output using...

Car Stereo Player Circuit

Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful...

1-30 Minute Timer

Using this 30 minute timer circuit you can switch on an appliance for a desired time. The circuit provides selectable time settings of 1,...

Car Fan Speed Controller Circuit

Using this fan speed controller circuit you can control the speed of 12V DC fans used in cars. The circuit is built around timer...

Mini UPS System

This mini ups circuit provides an uninterrupted power supply (UPS) to operate 12V, 9V and 5V DC-powered instruments at up to 1A current. The...

Duophone: Multiple Numbers Through One Telephone

This simple circuit of a duophone allows you to access two telephone lines through one telephone set. Each telephone conversation will remain entirely separate...

IR Based Light Control

This IR-based light control circuit turns on the lights at the portico, car parking or other areas when a motorbike or car enters through...

Motion Sensor for Security Light

Here is a motion sensor system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting...

Water Overflow Alarm

This water overflow alarm is built around two BC547 transistors and two 555 timer ICs

Generator Room Light Circuit

At night when power fails, one finds it difficult to reach the generator to start it. Here is the circuit for a generator room...

Photometer

An illuminance of 100 to 1000 lux is required for reading and doing close work without eye-strain. Specular illumination or bright sunlight provides 50,000...

Leakage and Continuity Tester

Here is a simple, chargeable leakage and continuity tester that can be operated in two modes: normal mode and gain mode. The gain mode...

Pyroelectric Fire Alarm

Here is an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo element to detect fire. The lead zirconate titanate...

Triple Mode Tone Generator

Here is a simple triple mode tone generator circuit that generates three different tones. You can use it as a call bell, burglar alarm...

Sound Enhancer Circuit

What binoculars do to improve your vision, this personal sound enhancer circuit does for listening. This light-weight spy ear gadget produces an adjustable gain...

Green LED Flashlight with 555 Timer

Here is a simple green LED flashlight built around a 555 timer IC (IC1) and powered from a 3V battery pack. Green LED-based flashlights are...

SMF Battery Guard

The emergency light is an automatic system in which a rechargeable battery-operated light source turns on as soon as the mains power fails. When...
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