This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's...
We find this circuit in a 1980s documentation. The integrated ones are of the time and their...
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...