Does this exist?: A mechanical rotary switch that - as it's rotated from position 1 to position N - connects the wiper to the contacts cumulatively rather than only one at a time.
For example, imagine a 1-pole 3-way switch with the following twist:
- In position 1, the wiper is connected to the first contact only (so far so normal);
- In position 2, the wiper is connected to the second AND the first contacts at once;
- In position 3, the wiper is connected to the third, second AND first contacts at once.
Reason for asking: I want to create a variable bass-cut tone control in an audio project. A cumulative rotary switch as described above would allow a number of capacitors to be progressively connected in parallel. (Please don't point me at alternative ways of making tone controls - I'm aware of circuits such as Baxandall, etc.)
Since this is an AC application I don't think I can rely on diodes.
Since composing this question I stumbled upon a web page that says "Rotary switches can also be designed to have many contacts happening at once on a single switch position." So it sounds like what I've describing is an example of that. But are such switches available to hobbyists?
I also read here that a multi-pole switch can be wired to achieve this. Sounds extravagant and, I confess, the way it would need to be wired is not leaping out at me.