A universal power supply system having a power supply configured to generate a predetermined direct current output sufficient to simultaneously power a plurality of direct current powered devices connected thereto. A plurality of identical sockets are electrically coupled in parallel with the direct current output of the power supply. Individual power cables having a standardized first plug which fits into the sockets at one end and a device specific second plug at an opposing end. A voltage regulating circuit is operatively disposed in either the standardized first plug or device specific second plug which converts the intermediate direct current voltage generated by the power supply to a direct current voltage required by a particular direct current powered device.