The MicroPak Controller, in conjunction with an appropriate cascade, is used to provide high voltage for advanced electrostatic application equipment. The controller can be supplied as a single, 3.2 inch wide Eurocard module and thus consumes less than 1/4 of the available space in a 19 inch rack. The MicroPak uses a combination of proven high voltage generation technology including microprocessor based control with diagnostic and communication functions. The processor circuitry drives highest levels of applicator transfer efficiency, while maintaining the maximum safety when used in conjunction with Ransburg applicators.