A system for driving an electromagnetic field generator. In one aspect, the system may include a plurality of transistors arranged in an H-bridge configuration, the H-bridge having first and second output terminals, first and second switching inputs, and a power input. The system may further include a control transistor coupling the power input to a power supply, and a diode having a cathode coupled to the power input and an anode coupled to ground. The first and second output terminals may be coupled to the electromagnetic field generator and the first and second switching inputs may receive switching signals based on an output of the electromagnetic field generator.