The purpose of this circuit is to silence the hiss that exists between the stations on an FM receiver. The circuit was found in American documentation from the 1980s.
The UAA180 integrated circuit is no longer manufactured, but if the reader finds one in a scrap...
Found in a 1967 General Electric SCR manual, this circuit uses a neon lamp to produce opposing SCR...
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...