Do you think your little -3v generator be able to provide -3v to all my analog switches? I need 10 quad analog switches (most likely the MAX4677-79) for my full application..
I've seen that IC's seem to exist to provide negative voltage as well.
Before forget, an analog signal expert told me that I should put a zero gain buffer on the output of each pickup for some reason. I believe he was concerned by noise in all the IC's. What do you think?
I'm trying to avoid PWM if possible. But on your circuit, by the way, I couldn' read the values on the Resistor and the 2 capacitors? Was that 100ohm resistor and 100 µF for both caps ?
- You need to be careful to limit the LED current to the device rating (11mA for the 10K version) using an external series resistor
You can get digipots that also take a negative supply (just like analog switches) so that they can handle negative voltages too. For example, http://www.farnell.com/datasheets/1697953.pdf.