On Mon, 17 Aug 1998 13:59:28 -0400 Shahid Sheikh writes: >Anyone has any idea on how to implement an electric brake for a small >DC >motor driven by a H bridge mosfet arrangement. >The problem is that the motor has a small flywheel attached to it >which >keeps it going for a while after the supply has been shut off. The usual method with a PM motor is to turn on both "top" or "bottom" switches of the bridge, so the motor sees a short circuit. It will stop a lot faster than just letting it coast down. This is about the best you can do without using power to drive the motor backwards until it stops. If the bridge is made of MOSFETS, a capacitor could store voltage to keep driving two of them for braking after the power is lost. Of course you need to be careful that the brake circuit doesn't interfere with normal operation. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]