Apparatus, and an associated method, for a power converter that provides operative power to a load device. The characteristics of the operative power are selectable, permitting the power supply to be used to power load devices of differing power requirements. An indicator indicates that electrical characteristics, such as voltage levels and polarities, to be exhibited by the operative power. A signal is generated by a command generator and provided to a power source. The power source extracts the informational content of the command and generates operative power of the selected characteristics.