Hi all, I am in need to create a system with which can output a AC signal of high voltage and also have good resolution at low voltages. Currently, I am using a function generator with an 100X amplifier connected to a potentiometer. When I want to use low voltage I turn the potentiometer to a high resistance, and vice versa. I want to use this equipment with automated control using labview to drive a piezo at high (off resonance) and low voltage (resonance). I would like for the resistance be changed simply using electronic switches. I was thinking about using a MOSFET, but I do not think the voltage may be too large (100 volts) for a MOSFET. Do you guys have any advice on my issue? Thanks in advance.