Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time. The transformer data is given next to the diagram.
We found this circuit in an old Radio Electronics. Components can be replaced by modern...
Found in documentation from the 90's this circuit is for low currents. The transistor can be...
This circuit was found in a 1992 publication. The critical component is the photodiode, but...