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 was obtained in a 90s documentation. However, it can be developed with modern...
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...
Found in the April 1980 issue of Radio Electronics magazine, this stage uses transistors from the...