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2000 Gain Preamp circuit 20Hz/20kHz help?

Nigel Goodwin

Super Moderator
Most Helpful Member
If you look at the top of the General Electronics forum, there's a 'sticky' about just that!.

 

audioguru

Well-Known Member
Most Helpful Member
Adding simple filters in series causes a droop in the frequency response before the cutoff, no sharp corner at cutoff.
An active filter uses an opamp to sharpen the cutoff corner, a Butterworth response has a sharp cutoff corner and a flat response before the corner.
An active second order Butterworth filter is twice as good as a single RC filter and higher orders are even better as shown here:
 

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