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.
We found this circuit in an old publication from Argentina. The relay must be of the sensitive type,...
This common 555 circuit was found in documentation from the 90s. The circuit uses two 555s and the...
Found in a 1967 Electronics World, this oscillator changes its tone when objects move in their...