We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
Found in a Motorola manual from the 1980s, this circuit uses components from the era. The circuit...
This circuit, which may have more inputs, consists of an optical OR gate using common...
Suggested by Amperex in a 1968 documentation, this circuit is based on TAA370, an integrated circuit...