This circuit was found in an old factory documentation. The circuit uses single-junction transistor SCRs at the time. These components support modern equivalents.
This 1967 Ferranti circuit uses company components. These transistors can be replaced by modern...
This simple thermostat circuit was found in the September 1976 issue of Radio Electronics...
This circuit is from an Electronics World of 1968. The transistors are of the time and the power...