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Magnet Operated Toggle Switch

When the author decided to develop a magnet operated toggle switch, what he had had in mind was an ‘unorthodox’ design that was as...

16-Way Clap Operated Switch

Control your home appliances with this clap operated switch, without getting out of your bed. You just have to clap in the vicinity of...

Continuity Tester With A Chirping Sound

Today, there’s a party at your home. And you are busy detecting faults in the decorative lights hanging over the boundaries of your house....

Shadow Alarm: Light Sensitive Circuit

This light sensitive alarm circuit sounds an alarm whenever a shadow falls on it. So it can be used at night by shopkeepers to...

Bicycle Guard

This anti-theft device for bicycles is inexpensive and can be constructed easily using a few components. At the heart of the circuit is a wheel...

Solar Powered Pedestal Lighting System

This solar-powered pedestal lighting system uses power LEDs for lighting. Solar energy is first converted into DC electricity by a solar photovoltaic cell and used to charge a storage battery.

3V PC Adaptor

Plug this circuit into the available USB output port of your PC to get 50mA, 3V DC. So it can be used to recharge, for instance, two NiCd cells (1.2Vx2) of a portable music player system.

Clock Controlled Timer Circuit

With this simple clock controlled timer, you will never again miss your favourite TV or radio programme. The TV or radio will switch on...

Miniature Strobe Light

Strobe lights are widely used by disco lovers to create wonderful visual effects in disco halls and auditoria. The circuit of a battery operated...

Mobile Theft Alarm

This circuit works as a mobile anti-theft system. It produces a loud chirping sound whenever someone tries to take away the mobile and also works as a mobile charger.

Aquatic Probe

A number of environmental factors including light and temperature affect fish culture. The temperature of water has profound effect because fish cannot breed above...

Liquid Level Alarm

In water-level controllers for tanks, a DC current is passed through the metallic probes fitted in the water tank to sense the water level....

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,...

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.

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...

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.
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