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 for analog video signals was found in a March 1988 Radio Electronics. The Maxim...
This circuit was found in an American 80's documentation. However, it can be implemented with...
This circuit appears elsewhere on our site with a variety of transistors. This one is from a Radio...