This circuit is from a Radio Electronics magazine from August 1974. It used one of the first photomultiplier tubes that was to be powered by high voltage. The power came from the mains.
The transistors in this circuit can be BD135 and BD136 for currents up to 500 mA. The circuit...
This circuit is for an inductive charger for the previous project, which can eventually be adapted...
This source is indicated for the supply of power amplifiers. The circuit is from 1999...