I have bought a PIC pc Oscilloscope but it will only except a 5v input. I have been trying to design an input circuit to reduce voltage that I am looking at from upto 20v amplitude to the 5volts needed by the scope. I am using crocodile clips to simulate the circuit, tried a simple devider and also using op-amp but not able to get any of my circuits working, anyone out there have a decent circuit I can use, please.