[EMAIL PROTECTED] wrote: > Hi Bruce, > > The capacitors' microphonic sensitivity may actuallyy be more of a factor > here. > Are electrolytics microphonic? Ferroelectric (X7R, Z5U,Y5V, X5R, etc but not NP0/C0G) ceramic caps are microphonic > > >> It still helps to have as low a noise as possible before using such >> brute force filtering to get that extra few dB of noise reduction. >> > > It's not just a few dB, it's -3dB at 17Hz already, and that drops at ~-20dB > per decade. At 170Hz it could theoretically give -23dB already, or in other > words if the noise floor was entirely due to the supply voltage noise, then > the difference would be between say -140dBc/Hz and about -160dBc/Hz at 170Hz > - > this could be a very significant improvement. > > You are absolutely right, it is very difficult to get low noise <10Hz. > > bye, > Said > Bruce
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