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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...

ANTI-BAG-SNATCHING ALARM

Here is a simple alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or suitcase sounds a...

Resistance Measurement Using Sample and Hold Method

A sample and hold circuit, as the name implies, samples an analogue input signal and holds its value until the input is again sampled. Fig....

Infrared Remote Control Timer

The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig. 1 shows the IR transmitter section. The astable multivibrator NE555...

Sound Scanner

This novel sound scanner sweeps all sound vibrations in its vicinity and converts them into audible beeps. It can sense sound vibrations up to...

LEAD-ACID BATTERY CHARGER WITH VOLTAGE ANALYSER

Nowadays maintenance-free lead-acid batteries are common in vehicles, inverters, and UPS systems. If the battery is left in a poor state of charge, its...

DIGITAL MAINS VOLTAGE INDICATOR

Continuous monitoring of the mains voltage is required in many applications such as manual voltage stabilisers and motor pumps. An analogue voltmeter, though cheap,...