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.
We found this circuit in an ancient American documentation. It can be adapted to operate in other...
This circuit was found in a 1965 Electronics Design. The configuration can be applied to current...
Found in an old publication, this circuit uses an analog milliammeter to indicate the position of a...