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 configuration shown was found in an old American manual. The circuit can be made with modern...
This circuit from a 1978 American publication is used on vintage vehicles that still have contact...
The MC1436 can also be used on this circuit found in Motorola's 1993 Linear Interface ICs. The...