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JAGADEESHWARAN C
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OVER- / UNDER-VOLTAGE PROTECTION OF ELECTRICAL APPLIANCES
C.H. VITHALANI   T his
circuit protects refrigerators as well as other appliances from over
and under-voltage. Operational amplifier IC LM324 (IC2) is used here as a
comparator. IC LM324 consists of four operational amplifiers, of which
only two operati...
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VOICE RECORDER AND PLAYBACK SYSTEM
There are several types of voice recorder and playback systems available in the market but most of them are expensive and their circuits
are also very complex to assemble. Here is a simple circuit for
recording and playback of voice messages. You can leav...
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WINDOW CHARGER
Keep away intruders with this compact
electrified window charger. The charger produces non-lethal shocks that
are strong enough to threaten intruders. The circuit uses IC CD4047 as a free-running astable multivibrator. Capacitor C1 and preset VR1 are timi...
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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 capacitor when it is
charged up to 63 percent of the applied voltage via a known resistor.
The time ...
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