This 1980s circuit was found in Motorola documentation. The circuit uses period components that admit of equivalents. Light feedback in a modern version can be done by optical fiber.
This is the basic configuration of an operational amplifier sample & hold circuit. The FET and...
The components of this filter are calculated using conventional formulas (see mathematics section of...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...