Hi Jinx Russell has probably mentioned this stuff already but in case he didn't... 1. If your circuit ever sees a stalled motor, then there will be a contest of sorts. Who will give out first? The power supply? The fets? The wiring? Just wondering... 2. You are being quite conservative in your gate drive setup. For example, your bottom fets have their excitation clamped at 7.5 volts. Is this enough to guarantee good turn on at all loads and temperatures? 3. Finally, dynamic effects. This is something to test carefully with a scope to ensure you are getting good turn on at the intended operating frequency. Look closely for inductive spikes (you look to have taken great care to snub these) and of course, verify operating temperature. Anything getting hot? Cook dinner on it? Good luck. Tom -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics