WOW! ⚡AC VOLTAGE⚡ Detector Circuit?! Can It Be?!

I could follow about the first half of this, but then he brought out the big boy whiteboard formulae, and I… just glazed past to where he cleans up the room. But, don’t worry. The regular kaboom is in the first half. Pretty funny.

ElectroBOOM – Nov 25, 2019 – 10:01
Is it possible to detect high AC voltage by just 3 transistors or the circuit is fake??

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