Circuit operation is as follows. A single hand clap will be picked up by the electric mic which is coupled through C1 into the op amp IC1. The output of IC1 triggers the 555 IC timer IC2 which is configured as a monostable multivibrater. The trigger pulse is stretched by IC2 and outputs a pulse [...]
The Opto-Thermo Alarm with IC 741 & 4001 is nice circuit,
It use IC 741 and IC 4001 for Light detector and Thermo detecto.
Read more : Opto-Thermo Alarm with IC 741 & 4001
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Light Detector Circuit by IC 4001
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The amplifier gets quite hot while in use, so decided to use a fan to cool it. The fan, however, adds a lot of noise. To get the best of both worlds, I thought I’d turn the fan on only when required. The circuit shown uses two forward-biased diodes, one as a sensor diode (at [...]
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