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.
We found this protection circuit for the power supply in a 1992 documentation. This circuit has...
I found this circuit in a documentation for radio amateurs from 1975. The FET could be the BF245....
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...