A power supply method an apparatus for powering electrical equipment, the electrical equipment operated by using current peaks. The methods include preparing a substrate made of a Group III-V semiconductor compound, and cleaning the substrate with a cleaning solution whose pH has been adjusted to an acidity of 2 to 6. This assembling structure and method can improve the workability when assembling the generator including the primary and secondary windings. The vapour at first becomes adsorbed on the walls of a cone-shaped distribution element situated between the lubricant supply means and the target object, from which it subsequently desorbs again. The region of the second conductivity mode is diffused in such a manner that it reaches the more highly doped region of the first doping type, with an outward diffusion of the doping from the more highly doped substrate layer into the more weakly doped layer of the same conductivity mode in the direction of the semiconductor surface taking place at the same time. The adapter connects a loudspeaker to the pipe.