Depending upon where in the world you live, AC mains frequency is either 50Hz or 60Hz, and that frequency is maintained accurately enough over time that it can be used as a time reference for a clock.
You can use a simple battery-poweredcircuit to detect whether anac-mains wire is live without makingany electrical contact with it. The circuituses a CD4011 NAND gate’s highinput impedance to sense a ...
Depending upon where in the world you live, AC mains frequency is either 50Hz or 60Hz, and that frequency is maintained accurately enough over time that it can be used as a time reference for a clock.
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