Not a direct solution, but you might want to look into buying a small
regulated 12 vdc power supply, such as an Astron RS 7A (7 amp) unit and
making up "cables" (of cheap speaker wire, as long you you keep plus and
minus obvious) to a variety of plugs, also available from RS. And a
soldering pencil. The Astron is not a switching supply and I've never
heard any RF noise from either of my mine.
Dave
