Abstract: A flyback transformer operable over a broad frequency range is used as a regulated high voltage power supply. A ringless, layer-wound transformer is operated far below its natural resonant frequency in response to a pulse width modulator which may be synchronized with a video display in order to prevent beat frequency images in a video display. Diodes are coupled between the layers of windings to reduce the leakage inductance and stray capacitance. The supply is particularly suitable for TV or monitor use but not exclusively, so any apparatus requiring a regulated high voltage supply may use the invention.