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Preamp noisefloor
Marco:
--- Quote from: Michaelaudio on July 30, 2020, 08:57:19 am ---@Marco ok ill do that, but why would it be an envelope detector, there is no signal just DC?
--- End quote ---
Lets say the input before the blocking capacitor is at zero volt and there's some positive input leakage current and the opamp input slowly gets biased to one diode drop below the zener voltage.
Now the input voltage drops, does that get transmitted faithfully to the opamp input? No, because it will start pulling more current through the diode. Only once the voltage on the input goes up and the diode starts blocking is there again correspondence between the input voltage and opamp input. Every time the diode goes below the previous lowest envelope voltage this kind of discontinuity will keep happening.
Michaelaudio:
Okay got it! So I replaced the 2 diodes with 100 now, and Biased the Pin 3 with a 10k too, and everything works now, thanks guys!
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