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  1. No. That would pull the opamp input to the rail....

    No. That would pull the opamp input to the rail. Capacitor is _across_ the lower resistor to short out noise voltage.
  2. A couple of things - adding a resistor of a...

    A couple of things -

    adding a resistor of a few k between the opamp output and Teensy pin will protect the teensy pin should it
    not be powered up when the opamp is.

    The virtual ground circuit...
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