Audioguru
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On all the other websites he is using a low voltage rail-to-raill Cmos opamp that has no input bias current.
I think the preamp should have most of the gain and that the Sallen and Key active Butterworth lowpass filter should have equal-component-values and a gain of only 1.6.
I think the preamp should have most of the gain and that the Sallen and Key active Butterworth lowpass filter should have equal-component-values and a gain of only 1.6.