What's the problem powering a Dr2d with the MP3300??? I see a 3v setting on the MP3300?
I haven't used the MP3300 with the DR2d, but probably would have until I saw your post...
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As has been reported and discussed in the DR-2d thread, and the recent MP3300 ebay thread, two of us have fried our DR-2d power input when connecting with the MP3300.
I don't have experience with other external power sources for the DR-2d besides the ones I mentioned, but my experience tells me that it is safest to use a battery with a usb output.
Adding in that I picked up some 'M' tips at RS for the MP3300 cable to power my 680 (making note of polarity.) And that I also use a PB15000 to power a Denecke PS2 sometimes.