Re: sensing the signal from a IC Pin

hi,
thanks for your replies. Its actually a PFC IC FA5502P from Fuji . I
read the dataheet, it mentions capacitor can range from 330pF to 1000pF
and resistance can vary from 10-75Kohm. The buffer i am connecting to
this pin has 1Megh input resistance and 3pF capacitance. The capacitor
now connected to this pin is 500pF. Adding this circuit there keeps the
net cap within the range. I am not able to understand random behaviour.

.

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