Am 27.08.19 um 18:55 schrieb ed breya:
You can also try capacitance multiplication with an active (power
gain) device - of course, it needs to have commensurately low noise too.
These seem really well suited for the job:
NPN: ZXTN07012EFFTA Beta forward = 1100, ultra-small Rbb, 12V 4.5A SOT23
PNP: ZXTP070012EFFTA both from Diodes, Inc.
The large beta allows a large R in the filter RC and thus reasonable
capacitors.
regards, Gerhard
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