Cap Voltage question

if pin2 is not grounded, it can be used as the -IN input.
It usually picks up the Signal Return, the NFB loop and the input filters.
This more usual arrangement allows complete separation of Signal Ground from Power Ground.

But, the 386 is not an opamp in the usual sense.
It allows single polarity supply and yet gives an output referenced to Power Ground. That is unusual.
 
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