This circuit was found in documentation from the 1980s. The integrated circuit is from the time and the voltage depends on the desired power, and the component's datasheet should be consulted.
We found this circuit in an American publication from the 90s. The transistors must be provided with...
The critical components of this project from a 1978 publication are the transformers, which can be...
September 2017 - Mouser Electronics already has the AP431S adjustable regulator from Diodes...