@NoobMan, these drivers already have ROSC shorted to ground, see the schematic here
@nophead, it's a 12v PC supply (a Corsair CX430M, to be specific)
I have 4 of these drivers, all behave the same, however the supplier has sold hundreds of these without problems, which would imply something unique in my setup or environment. I made this video last night of an A4982 on the Y axis of my old printer (A4988's on all other steppers), the whine when stationary is much less pronounced (which I'm putting down to differences in the smaller stepper motor on that printer (Wantai 42BYGHW609)), but you can clearly hear that Y axis moves are much louder than X.
@nophead, it's a 12v PC supply (a Corsair CX430M, to be specific)
I have 4 of these drivers, all behave the same, however the supplier has sold hundreds of these without problems, which would imply something unique in my setup or environment. I made this video last night of an A4982 on the Y axis of my old printer (A4988's on all other steppers), the whine when stationary is much less pronounced (which I'm putting down to differences in the smaller stepper motor on that printer (Wantai 42BYGHW609)), but you can clearly hear that Y axis moves are much louder than X.