WTPA2 Power Supply Requirements

Hi -- I've gotten some questions about the PSU requirements on WTPA2 so here's the blurb.  And yep, I should update the manual.

Any PSU with the following specs will work:

Center Positive
>=300mA capacity (current rating)
Plug Diameter: 2.1mm ID, 5.5mm OD

This is more or less a "generic" 9v wall wart.  Digikey has a over a hundred that would work and I've got a radio shack adapter on my desk too that I use.
Here's an example from DK:

Some units are noisier than others, I know.  My quietest one is this, but it's still not perfect.

Basically WTPA2 doesn't care that much and you won't break it by plugging in the wrong thing.

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