We have system like on the photo below. These logarithmic potentiometers(10k Ohm) are adjusting motor speed. One potentiometer is used to adjust speed of motor when door contact is closed(door is open) and other one is when door is closed(it is adjusted to %20 of speed in standby mode)
Normally, door contact is connected to relay which is supplied by 20V but in some variants, 20V is not possible.
I would like ask if there is any possibility to switch between potentiometers without relay. Another idea can be switching 10V instead of A1 but I couldn't find a proper way with full potential(10V)
Idea is to make it as cheap as possible.
PS: Normally door contact is just on/off. not a spdt.