On 8/17/05, Russell McMahon wrote: > Criticism sought. > > http://russell.servepics.com/temp/r100b.gif > > Criticism invited. Russel, wrong or right drawing this design can't be more cheaper that a standard integrated H bridge. You forgot from the total cost of this design the time spent with PCB design and component soldering. In fact I think is more expensive than most of the standard H bridges adapted for your requirements. Except maybe if you plan to produce it in China with chinese transistors. 2 eurocent criticism done, Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist