I would like to make a 4-pole, 2-stage filter for audio, but I want it to be variable. As it stands, I would need a 4-gang potentiometer to handle this. I do not believe such a thing exists, or if it does, it would be very expensive.
How can I achieve a variable critical frequency? My other idea is to investigate digital potentiometers.
How can I achieve a variable critical frequency? My other idea is to investigate digital potentiometers.