Abstract: A switching regulator power supply operates at a variable high frequency with low power dissipation and a minimum of complexity. The transformer primary windings are included as part of a self-starting circuit which starts a pulse generator having a fixed frequency and variable pulse width. The self-starting circuit includes a control circuit network which connects to the transformer primary windings and a low voltage regulator circuit connects to the pulse generator and network. The control circuit network provides the voltage regulator circuit with the desired current characteristics of high instantaneous current during a short turn-on time interval and a zero current during power supply operation. The self-starting circuit in response to the input rectified AC power after the short turn-on period of time applies sufficient voltage which enables the pulse generator to begin generating a first output pulse.