Abstract: A square wave clock signal is coupled to a transistor, the output of which is transformer coupled to the base of a driver transistor. The conducting of the driver transistor will cause an increase in the current through the primary of a flyback transformer, thereby resulting in a relatively small negative going voltage potential being induced therein. When the driver transistor is caused to go into a non-conducting state, due to the signal on the base, the decrease in current through the primary of the flyback transformer in relation to the change in time is large, thereby inducing a large positive voltage potential across the primary. The induced voltage is stepped-up by the flyback transformer where the negative overring portion is rectified and regulated to supply a potential to the grid of an ion source.