This charger was found in an 80's Electronic Design. The circuit uses components from that time. Equivalents can be tested.
The circuit is from an 80's publication, but the components are current, only special type diodes...
The maximum current of this power supply is 2 A and the output voltage can be set between 6 and 24 V. The...
This is a circuit of the 80's ON Semiconductor thyristor manual. Of course, the configuration can be...