Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Fucian-at-aol-dot-com> Hi, i just had an idea and thought I would let the pros handle it. When the coil jumps out of tune, the MOSFET quickly becomes hot...Could I place a thermister on the MOSFET and use a circuit to retune the pulser according to the thermistors change in resistance? Matt