This circuit was found in a Popular Electronics from the 90s. Its purpose is to disable the output of an FM or VHF receiver between stations, preventing the reproduction of hiss.
When the sensor receives light, the relay closes its contacts and remains so even after the light...
The indicated circuit is an intermittent one in which we use two 555 integrated ones, one as a low...
The indicator for this circuit is a 0 to 1 mA milliammeter. The operational is from the 70s, when...