IIRC, the plastic spinner has two magnets in it that pass over two parallel (reed?) switches.  The magnets activate each switch in turn with two rapid pulses produced.  Depending upon the order of the pulses, i.e. Switch 1 then Switch 2 or Switch 2 then Switch 1 dictates how the CV determines the direction the spinner is turning.  As these are simply switches like all other controller actions (not optical) I believe they do not require any power.  Attached are the controller schematic and PCB la