This circuit works like a solid-state contactor. We find it in General Electric documentation from 1965. SCRs can be modern equivalents according to the controlled load.
This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm...
This circuit triggers producing a loud sound when a change in temperature is detected. The circuit...
This simple transistor test circuit was found in Radio Elecronics magazine from October 1961. It...