This circuit was found in a 1965 General Electric manual. It is intended for cars that have negative ground. At the time there were vehicles with positive mass.
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...