Live line Detector

Posted on Nov 16, 2012

Detects the presence of a live mains conductor. Minimum parts counting. If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains 50Hz frequency by 10.

Live line Detector
Click here to download the full size of the above Circuit.

* Sensitivity can be varied using a more or less long sensing probe. * Due to 3V operation, the LED`s current limiting resistor can be omitted. When remote from a live line, the unit stops counting, the LED resulting permanently off.

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