only tried unloaded so far, but quiet as a mouse... faint whine if you listen hard...
Happy days... Is that in full or half step?

When I tested my board,(simlar to PMINMO) at 1/2 step they squeeled like little piggys. (probably didnt help as the pulse came from me tapping a wire at o.5v onto the pin :whistling:) havent got around to trying it with the pulser you designed.

BTW. is that + 0r - edge output? I beleive the L297 requires a - edge.?