<< I know I'm not trying to pull too much current - the motor only uses around 200mA Are you sure? This is possible, but sounds rather thin. What voltage is the motor supposed to receive at full on? What is the power supply voltage? What current can the power supply deliver at the design voltage?>> I thought so too, but at 6v that's about what they pull. I pulled the motor and gearbox from some small, cheap r/c car, so I wasn't expecting professional high power motors. Even so, they put out a fair amount of torque and speed for their size and the power they draw. To be sure that the voltage wasn't the problem, I tried the mosfets out of the H-bridge and successfully switched them at 6v, and also tried the H-bridge at 12v to see if it made any difference. It didn't. I did manage to make the circuit work, which I'll explain in a separate posting to everyone. > and the P > and N mosfets are rated at 2.0 and 4.0 amps, repectively. Using only one of > the mosfets, switching in only one direction, I have no problem running the > motor. Huh?!!! Something is very wrong here. The motor should be off unless TWO of the FETs from opposite corners of the H are on. Only one FET out of the four on should cause nothing to happen. This is a good clue as to what is wrong with your wiring. Find the cause to this and fix it before proceeding. You may have a shorted FET somewhere, or more likely one that is incorrectly wired so that it ends up conducting when it shouldn't. >> What I meant by "only one" was that I used the mosfet out of the h-bridge, driving it independent of the ESC circuit. When using it as a switch, I had no problem. The h-b works as it should with the correct combinations of mosfets on and off, it's just not allowing much power. -Tony -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body