Mark Rages wrote:
>> 1 - There should be a cap to ground from the node between R1 and R2.
>> Otherwise any supply noise and anything that node picks up is going to
>> end up on the signal.  There should be at least a 100nF ceramic, and
>> maybe a 10uF electrolytic too.  A single 1uF ceramic is probably good
>> enough.
>
> But then it won't cancel supply noise from the mic.

Right, but then it wasn't doing that before either.

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