Low noise power supply

The invention relates to a circuit arrangement having at least one transformer having a primary and a secondary winding, said primary winding being connectable to an input voltage via a full bridge circuit with two bridge arms, wherein the full bridge circuit of four switching elements, each having a circuit relief, as well as in series with the transformer connected in a capacitor, and having a coil, wherein through the secondary winding and at least two diodes and an output capacitor, an output voltage can be tapped at least and wherein the output voltage is controlled via a phase shift of the two bridge branches. In order to meet the requirement for a low noise emission, it is proposed that at least one Umschwingkapazitat is arranged between the secondary winding and the output capacitor.