2000 Gain Preamp circuit 20Hz/20kHz help?

[Nigel Goodwin]

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

Basic opamp circuits

This question is asked repeatedly, and Audioguru always posts a really helpful graphic showing inverting and non-inverting opamp circuits for both single and dual supplies. So to avoid him doing this every time, I'm placing his graphic here, and making this thread 'sticky'. I've also uploaded...

www.electro-tech-online.com

 

[audioguru]

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: