I have a magnoresistive current sensor, where it requires a +/- 12to15 VDC
supply to feed an opamp, and the output is across an internal resistor to
generate a voltage relative to the input current.  Of course the output does
follow the 60Hz sine wave, so to get a measurement I just need to sample at
the peak of the input, not a big deal.  But, the voltage output ground
reference is not the same as the opamp voltage ground, so the only way I see
to make this work is to either isolate the output with a voltage follower,
or use a complete seperate power supply/ground for the sensor and tie the
sensor output reference gnd to the PIC ground.

Any thoughts?


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