Electronics > Beginners

MOSFET turned off - strange voltage drop

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tester43:
Hi,

Is this because if bridge not being loaded with MOSFET closed then the whole PCB + wiring works as a capacitor for the circuit? Or is it different effect?

StillTrying:
Yes, when the bridge rectifier and everything else has stopped conducting at 0.8V, it's just a floating voltage on the stray capacitances.
The first opto could be replaced by 3 resistors, one from each AC connection, and one to 0V.

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