Hi,
There is a misunderstanding.
My "what else did you expect" did not refer to our answers.
It referred to your sentence: "but they dont seem accurate to me"
To me it seemed you did not expect the "3Hz" but any other value.
Klaus
Since you want the preamp to produce 20Hz without any loss of level and the preamp has three RC highpass filters then each filter should have a -3dB cutoff at about 1.5Hz. Then -9dB at 1.5Hz, -6dB at 3Hz, -3db at 6Hz and beginning to reduce levels at about 20Hz.
There are no different TL071 types manufactured. Fake ICs from dubious sources?OK then I ordered 50 of the Tl071 chips, I have only one that has a different letter at the end.
The odd one works
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