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Photodiode Based Fire Detector

This ultra-sensitive photodiode based fire detector protects your electronic devices like computer and television set. It uses a photodiode as the fire sensor and...

Audio Controlled Running Light

This mains operated audio controlled running light can be used in discotheques. The lamps glow in running sequence as per the sound of music....

Melody Generator With Instrumental Effect

This is a circuit for a melody generator that can provide various modes of melodies along with instrumental effect that can be chosen through dip switches.

PC Temperature Controller

Here is a simple temperature controller that turns your personnel computer (PC) off when the temperature of the PC increases beyond the optimal temperature value. Some of the larger integrated circuits become quite hot and if the temperature inside the PC

Musical Light Chaser

This music operated lighting effect generator comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets glow one after...

Ultrasonic Proximity Detector

This ultrasonic proximity detector comprising independent, battery-powered transmitter and receiver sections makes use of a pair of matched ultrasonic piezoceramic transducers operating at around...

Wire Break Alarm With Delay

Here is a simple circuit of wire-break alarm that activates after a delay of 15 to 30 seconds. When the thin-wire loop running across the entrance door is broken, the alarm sounds after a delay of 15 to 30 seconds, the time period set through VR1.

Car Porch Guard

Protect your costly vehicle from theft using this electronic car porch guard system. The system immediately switches on the porch lamp and sounds a...

Pressure Sensitive Alarm

Here is a low-cost, pressure sensitive alarm. The alarm uses a home-made pressure sensor, which works as a variable capacitor using two copper-clad boards...

PC Multimedia Speaker

This is a circuit for USB compatible low cost and low power multimedia speakers for PC.

Solar Lighting System

The world cannot continue to rely for long on fossil fuels for its energy requirements. Fossil fuel reserves are limited. In addition, when burnt,...

Fire Alarm

With the onset of summer, chances of fire accidents increase. Such fire accidents can be prevented if timely alarms are available. The fire alarm...

Remote Control Tester

Here is a simple remote control tester for checking the basic operations of an infrared remote control unit. It is low cost and easy...

Multidoor Opening Alarm with Indicator

This door opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small...

Musical Touch Bell

Here is a musical call bell that can be operated by just bridging the gap between the touch plates with one’s fingertips. Thus there...

Smart Cellphone Holder

This smart cellphone holder makes sure that you don’t forget to carry your mobile phone. Fitted in the car, it keeps searching for the...

Sensitive Vibration Detector

This sensitive vibration detector is realised using readily available, low cost components. One of its many applications is in a rolling shutter guard for...

Digital Counter

A counter whose logical output increments in steps on receiving clock pulses is used for a variety of counting and timing applications. It is at the heart of digital clock circuitry and other similar timing devices.
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