There’s plenty of truth to that old saw, especially when a switch-mode power supply from the 1940s still ... to conduct large currents. In this circuit, the Thyratrons are used as half-wave ...

The common type of power supply ... The "switching" comes from switching a transistor on and off to create square waves for input to a transformer. For more details and diagrams, see transformer.

But for circuits where weight ... and the final design uses the venerable 555 timer to build a switching power supply. Although it is noted several times throughout the guide, we’ll still ...