I wish to design a simple circuit, but I do not have the knowledge required. So I was hoping someone could help me. I am willing to pay a modest fee for your time.
Here is a description of the function... I wish to measure the change in potential across the human body. The baseline potential is about 70mV and the change is around +/- 30mV. A basic indication is all that I require. The function is to calibrate the device to get the potential at this moment by turning a dial to make two LEDs go off. Then the stimulus is applied to change the potential. If the potential goes above the calibrated set point, one LED comes on. If is goes below the calibrated set point, the other LED comes on.
Thanks Damien