Method and supply system for the operation of a plurality of independent electrical devices and electrical device and plug-in adapter system

A method for the operation of a plurality of independent electrical devices (2a, 2b, 2c), in particular of equipment of entertainment electronics, with the electrical devices (2a, 2b, 2c) each have at least one functional DC component (21a, 21b, 21c) which characterized in that the DC components (21a, 21b, 21c) are supplied to the electrical devices (2a, 2b, 2c) through a central DC voltage source (3) with energy.