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 two-year-80s circuit consists of a solution for a small portable recorder powered by cells, as...
This circuit is from a 1992 Electronics Handbook. The circuit generates a special tone effect for...
The operational Amplifier used in this circuit is uncommon today. However, the same circuit can be...