So I'm working at a TV repair shop but really we fix and work on almost anything electronic. In this situation we have a NEUROSIGN 100 which is used to tell the surgeon when he's near the nerve, but he needs the voltage spike to be recorded on paper when he touches the nerve. The problem is that the machine only gives out around 30uV-300uV as he is working and the electronic ghraph we have only startes recording at 1mV. We need a way to step up that voltage coming out the machine so that ghraph will record it. We tried a small audio amplifier but that didn't work at all so we're back to the drawing board.