You need to drive the stepper motor through transistors. 4N26 optos are not needed. If you need I can send you schematic and the PIC code for it. Harley L. Miller wrote: > I want to start experimenting in driving stepper motors with a 16f84. > I > have an old stepper from a junk disk drive and understand (roughly) > how > to make it step. My question is, can it be driven directly from the > PIC > or do I need to go through something like a 4N26 (just got a batch > from > Mouser)? > > Harley L. Miller hmiller@sound.net > WB0ROQ Bye Pailoor -- Chip Technologies Microchip Design Consultant No. 70, 9th Main Road, Mathikere, Bangalore - 560 054. INDIA Tel : +91-80-3362807 Fax : +91-80-3369451 Email : chiptech@vsnl.com Webpage : http://business.vsnl.com/chiptech