This circuit, with printed circuit board included, is from a Radio Electronics magazine from July 1971. The SCR can be any equivalent of the 106 series.
This power supply that can supply current according to the LEC is suitable for small projects. The LED...
Obtained in an American documentation from 1976, this circuit has a constant current source for...
This two-transistor output stage source currents up to 100 mA to a load using the 2N3906, but can...