I’ve played around with a power supplies in the past and each one seems to have a safety feature preventing electrocution even when touching something which has a current running through it. How does this work? How does the power supply know that’s it’s touching skin as opposed to another conductive material.
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It’s just a low voltage isolated power supply. There is simply not enough voltage to overcome your skin resistance. You would find it to sting if you licked a 5-12V power supply’s terminals (don’t do that, that’s putting more trust in the isolation quality of a 2$ made in China wonder than comfortable) much like a 9V battery does, and when fiddling with circuits on a breadboard I sometimes accidentally brush the stretched skin of my finger joint against a terminal with 12V on it which feels like I just poked something sharp.
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