This indicator circuit used and game machines (arcades) to indicate that the machine is being shaken was found in NASA documentation. The circuit uses as a sensor a container with water and three sensors.
Found in a 1964 Electronic Design, this circuit protects the transistors of a complementary output stage. The...
Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be...
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...