Abstract: A high-voltage generator for electrostatic sprayer devices includes a frequency-clocked power amplifier for feeding the primary of a transformer whose secondary is connected to a high-voltage cascade or multiplier circuit. The power amplifier is connected to a controllable low-voltage d.c. voltage source and to a controllable frequency generator, whereby the control of the d.c. voltage source and of the frequency generator is provided by a microcomputer such that the transformer is optimally matched for all voltages appearing at the high-voltage output of the cascade.