4 phase hybrid stepping driver rvfm p300 2 this hybrid stepping driver is a cost effective unit designed to drive 4 phase stepper motors this driver is supplied by direct current with dc input voltage of 18 36v an unregulated smoothed rectified ac transformer output can also be used as the supply in this case the rectified ac peak voltage must be less than 38v and the transformer secondary ac output should be less than 23v br br it has strong anti interference capability with