This power supply was found in the same 1990 special issue of Radio Electronics Experimenter magazine that describes an amplifier of up to 100 W per channel with the LM12.
This latched circuit uses an LDR as a sensor. It must be powered by a voltage of 5 V....
This circuit was taken from Maxim documentation from the 90s. The components are from the period....
This circuit is from an old 1953 publication using one of the first commercial transistors...