I am working on a zero crossing detector circuit. Can anyone please explain the function of highlighted circuit?
Electronic – Zero Crossing Detector Circuit
diodespower electronicstransistorszero crossing
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Best Answer
Q1 and D5 act as a pair of anti-parallel diodes allowing current to flow both ways through C1
when C1 is charging the current flows through D1, when discharging through Q1s base to it emitter.
This discharging turns on Q1 lighting the LED
The claim that this is a precision zero crossing detector seems dubious.