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The FET conducts DC and its gain is proportional to the DC voltage drop.


The  BP filter that I made are impedance scalable to 10xR and C/10 and AC coupled so the FET pullup you choose is smaller than the load, and the 5 uF is not required.

 .  Any questions? BOM cost 25 cents, incl mic and logic level out.  MOQ + shipping & tax


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