This is the basic configuration of an operational amplifier sample & hold circuit. The FET and transistor are commonly used. The circuit is from an 80's documentation.
The component used in this circuit is uncommon today, as the circuit was obtained from Motorola's Linear...
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...
Taking advantage of the two stable states of a tunnel diode it is possible to build a switching circuit...