I need to make a power return monitor for the utility mains at my house so I know when to return to grid power from generator power during outages. I found a super simple circuit using an LM386 amplifier chip, however the LM386 has a minimum VCC of 5V, which isn't going to work with a 3.3V ESP modu…

ESP32 no contact dual channel voltage detector

rhys79 January 24, 2024, 5:04am 9

Nice, so a half dozen or so turns of wire around a hot leg, to say a 3V zener and 10pf ceramic to ground, into a digital input?

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