Basic Op-Amp Circuits

Q1:
The critical frequency for the active filter in the given circuit is approximately _______.

A 20.1 kHz

B 89.3 kHz

C 14.2 kHz

D 179 kHz

ANS:A - 20.1 kHz

Use formula for second order low pass filter :

f= 1/sqrt(r1*r2*c1*c2)



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