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Car Porch Guard

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

PICNIC LAMP

You can take this white LED based night lamp on your picnic outings. The lamp has sound trigger and push-to-on facilities and gives ample...

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...

SHADOW ALARM

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

Water-Tank Overflow Indicator

Water is a vital but scarce natural resource. To prevent water wastage, this water-tank overflow indicator comes in handy. It gives audio as well...

Audio Mixer with Multiple Controls

When recording sound from several orchestral instruments being played by different musicians using a single microphone, the only way to adjust the sound balance...

FUEL RESERVE INDICATOR FOR VEHICLES

Here is a simple circuit for monitoring the fuel level in vehicles. It gives an audiovisual indication when the fuel level drops alarmingly below...

BRAKE FAILURE INDICATOR

Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the...

Pencell Charge Indicator

Small-size AA cells and button cells used in electronic devices providing a terminal voltage of 1.5V are normally rated at 500 mAh. As the...

Laser Torch-Based Voice Transmitter And Receiver

Using this circuit you can communicate with your neighbours wirelessly. Instead of RF signals, light from a laser torch is used as the carrier...

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