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 circuit uses a large surface diode to detect radiation (alpha and beta particles, in addition to...
This preamplifier for the phonographic capsule was obtained in an Argentine publication from 1973....
This circuit is from a 1993 publication and can be implemented with any optical isolator that has...