Never rely on internal diodes to do the job of external snubbing. There's no way the substrate of the ULN device can handle the spike supression of any motor. The internal diodes are there as a last resort, not the first line of defense. ~Rick "Gustaf J. Barkstrom" wrote: > I will rely on the internal kickback protection diodes. > Gustaf > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.