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.
This circuit, from the SGS manual of linear integrated circuits of 1982, uses the muting input to...
This audio configuration of televisions from the 1960s was found in a Mullard transistor reference...
This long delay circuit was found in the July 1973 Radio Electronics magazine. The capacitor...