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Mobile Cellphone Charger

Charging of the cellphone battery is a big problem while travelling as power supply source is not generally accessible. If you keep your cellphone...

Fuse-Cum-Power Failure Indicator

This fuse-cum-power failure indicator comprises an LED (LED1), light-dependent resistor (LDR1), inverter circuit and two timer circuits built around IC NE555. LDR1 and preset...

Doorbell-Controlled Porchlight

This add-on circuit automatically turns on your porchlight when your doorbell rings, so you can see the person ringing the doorbell at the doorstep....

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...

Versatile Proximity Detector with Auto Reset

Electrochemical processes taking place in our body generate complex sig-nals (hum) that are continuously being passed along the nerve fibres throughout the body. Any...

Experimental Study of Switched-Capacitor Circuit

In recent years switched-capacitor circuits have gained popularity due to their suitability in integrated circuits. The two major problems faced by IC designers are: 1. Implementing...

AUTOMATIC NIGHT LAMP WITH MORNING ALARM

This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight...

Flashing Headlight for Mobikes

The dipper for a vehicle’s headlight changes the light from high beam to low beam or vice versa given a particular set of road...

Electrolytic Capacitor Tester

Using this electrolytic capacitor tester you can detect leaky and dead (open) electrolytic capacitors. It operates based on the time constant (T) of the...

Auto Snooze for Digital Alarm Clocks

Alarm clocks are made to wake you up. However, it is quite bothersome to hear the alarm continuously until you get up and put...

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