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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...

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 another...

Sound-Operated Intruder Alarm

When this burglar alarm detects any sound, such as that created by opening of a door or inserting a key into the lock, it...

Noise Meter

Normally, sound intensity up to 30 dB is pleasant. Above 80 dB, it becomes annoying. And if it goes beyond 100 dB, it may...

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