is there an electrical component that exists that would act similar to a potentiometer, but could be turned either clockwise or counterclockwise past a middle point, and would either release positive or negative voltage depending on which direction past that point?
So for example, you would turn it left to release a negative voltage, and turn it back to the right to release a positive voltage.
If this doesn't exist, is there a simple circuit I could create to emulate this ability?
Thanks