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.
In this circuit the capacitor under test is charged at switch position A and then discharged...
This is a common circuit in the 1990s, when experimental FM transmitters were in vogue. The...
Using a piezoelectric sensor of the time, this circuit was found in the February 1994 issue of...