A dumb RC filter

[junderwood]

Here's a dumb idea to bake your noodle with:


It uses a 4pdt switch, a cap, and a resistor to make a simple switchable single pole passive low pass or high pass filter. Probably not much use but fun to think about. I haven't breadboarded it or anything, I was just doodlin'

 

[Robert]

Also untested, but you should be able to do this with a DPDT as well: