Found in 1969 RCA documentation, this circuit maintains constant current in the filament of a lamp or in a heating element. The circuit makes use of period components.
This configuration appears elsewhere on this site. We obtained it from a 90s Radio Electronics, based...
This circuit is from a Fairchild digital clock module shown in the March 1977 issue of Radio...
This good power amplifier, a few tens of watts, is part of an article in the December 1972 Radio...