Suggested by General Electric in a 1965 document, this circuit can accept a greater number of sensors. When anyone opens the SCR it fires powering the load.
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
This circuit triggers producing a loud sound when a change in temperature is detected. The circuit...
This circuit was found in a 1976 documentation. It can be used with old tape recording mechanisms for...