This circuit was found in a 1980s documentation. Similar configurations appear in the section, but from different sources. The circuit makes use of components of the time.
This typical crystal oscillator configuration can generate signals up to a few tens of megahertz...
This simple servo can be built by coupling a potentiometer to a reduction box with a 3 to 6V...
This constant current source for high voltage loads was obtained from a 1967 General Electric...