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 Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and...
This circuit was found in an American documentation from 1968. The configuration can be adapted to...
We found this configuration in the Linear Applications Handbook of the National Semiconductor of...