This circuit was found in a Radio Electronics magazine from November 1992. The components are from that time and the power supply must be dual.
Found in a 1967 RCA documentation, this AC power grid contactor can be fitted with modern...
This siren circuit was found in 1987. The components are common, and power is provided by standard...
This circuit was found in a Radio Electronics from January 1965. The relay is 9V, but we can...