This is another sampling and holding circuit found in a factory manual from the 1980s. The circuit can be implemented with more modern components. The FET is not a common component today.
This circuit was suggested by General Electric in a 1969 documentation. The transistors are of the...
This static switch circuit or solid-state contactor was found in a Motorola documentation from...
In the figure we have a typical constant current source circuit. Transistor can be equivalent as...