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 flasher was found in an 80's Electronic Engineering but can be easily implemented with modern...
This simple reducer can supply devices that require currents up to 1 A. The power transistor must be...
This interesting circuit converts BCD signals into a voltage that can be used in an analog...