The previous page sorted the input. Now we take care of the power supply and the output of the amplifier. To test that the amplifier is working we need some kind of oscilloscope. We use the USB-DUX sigma data acquisition board which comes with an oscilloscope program called comedirecord. The USB-DUX sigma has 16 analogue electrically isolated inputs and we connect our bio-amplifier to channel 0. It also provides isolated +/-5V so that our amplifier is isolated from the computer. This is important when measuring from subjects.
next step: The differential amplifier