In a message dated 97-12-07 19:15:11 EST, you write: << After flaming untested H-Bridges posted to the Parallax Stamps list and promising to provide a tested one, I got very busy with real work. Months passed. I've surfaced from those work-related distractions, and spent a little time coming up with a cheesy H-bridge that works pretty well. Feel free to tell me how crappy it is. http://www.bobblick.com/bob/projects/hbridge/index.html Cheers, Bob >> Hello Bob! After spending a great deal of time my self trying to get textbook examples of H-bridge circuits to work, I had thought they were some sort of un attainable mythical beast. I abandoned my work in favor of more integrated soulutions after evaluating the silicon carnage in my wake! If you got one working, the last thing you will hear from me is critical evaluation of your work. My hats off to you! Dave Duley V.P. Dreitek Inc. www.dreitek.com