Btw, for the record, the basis of my design is these wonderful people here: http://dev.www.reprap.org/bin/view/Main/Stepper_Motor_Driver_2_3 DougM -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Josh Koffman Sent: Sunday, December 13, 2009 8:57 AM To: Microcontroller discussion list - Public. Subject: Re: [EE] Stepper Motor Driver On Sun, Dec 13, 2009 at 11:13 AM, Doug Metzler wrote: > Looking at it now I don't think the 2.2k on top of the 10k pot is right - > with that combination your Vref max goes way higher than 0.5v, so be > careful. > > I'm going to review it on my board. My memory of the datasheet is that Vref is 0 to 4V. I'd have to double check it though. With a 2.2K resistor you could end up a little higher than 4V. Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist