i'm looking for a simple hardware circuit that delivers the differential voltage from two voltages.
It is an AC voltage of about 0.5 to 5V which is measured before and after a resistor.
Is it possible to use an OP TL071CN, for example?
I would like to read the signal into a controller and continue working on it.
To make it fast I do not want to read the two voltages with the controller and then form the difference!