Q. What is the drawback in zero crossing detectors?

A
Low frequency signal and noise at input terminal
B
Low frequency signal and noise at output terminal
C
High frequency signal and noise at input terminal
D
High frequency signal and noise at input terminal
Solution:

Due to low frequency signal, the output voltage may not switch quickly from one saturation voltage to other. The presence of noise can fluctuate the output between two saturation voltages.

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