I know that the ones for the 1400, and Wallstreet G3 - Pismo G3 will run a Duo and those Yoyo ones used on the old iBook Clamshells will work on those machines, so they should work on the Duos. Thing it, the Duo Power requirement is a lot lower than the Yoyo PSU can put out so keep an eye out for over heating or other problems and be ready to yank the plug in an emergency.