Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next to the diagram, the formula for calculating the components.
Constant currents from 10 mA to 1 A can supply the load, depending on the selection made by S1. Q1...
In the figure we have two typical configurations of voltage regulators with protection against short...
Found in an old Radio Electronics, this circuit uses current components, used to rectify AC...