1) If I wish to put a cooling fan for cooling motor drivers on the same power supply as the one sourcing one of the 2 stepper motor pairs.
(total of 2 power supplies + the digital side from USB power)
Should I put some electrical stabilization for protecting the digital circuitry?
My motor power source is 12V/4A and the digital is sourced by USB through Parallax Flip board.
2) I do not remember why, but I managed a while ago to have TWO DC power supplies 12V/4A, each driving 2 stepper motors, besides the Parallax Flip board for digital sides.
Does anybody see any possible problem between the two power supplies working in parallel? (Of course all on a common Ground).