Abstract: The stabilization of all of the output voltages of a switching power supply is obtained by varying the time of flow of the current in a semiconductor interrupter circuit with a constant interruption repetition cycle, by controlling the interrupter through a magnetic amplifier. The power supply includes a voltage converting circuit comprising an automatic balancing circuit, magnetic amplifiers and a saturable reactor for limiting the dissipation of power in conditions of overload through an increase of the frequency of operation of the discharge stabilizing circuit.