we use the Allegro 3977's at work - they're good chips, but if you flip them over you'll see that they have a metal plate on the base - *make sure* that base is grounded properly - I use the silver CPU heat sink stuff. If you don't ground it correctly you'll be replacing them quite often. DougM On Thu, Dec 10, 2009 at 2:06 PM, Josh Koffman wrote: > On Thu, Dec 10, 2009 at 2:51 AM, Jinx wrote: > > I inherited a load of boards with L297 / L293 pairs. The L293 is OK > > as an inexpensive driver but I'd have been looking for a cheaper IC > > than the L297 logic/power interface. Its functions are pretty basic, and > > Microchip have an app note for something similar. Google for Microchip > > stepper > > I had looked at them, but the combination is about CAD$17, while the > Allegro 3982 is under $7. This is in singles so while the $10 isn't a > killer, it'd be nice to be somewhat economical. > > The only bummer about the Allegro part is that it's SMT only. That's > great for my final use but not as great for prototyping. Definitely > not a deal killer though. > > 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