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 General Electric circuit is from the 80's. The PUTs used in this meter are not common...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...
Found in 1965 General Electric documentation this circuit applies to a LASCR used as an optical...