I've got a saber with a 1A puck wired up like this. Works just fine.
As far as the AC/DC thing goes, if you found the right adapter, it could work. Almost any AC to DC adapter would work, as long as the output was within the input range for a puck. Here's a thread I remember from last year where we were talking about the same thing. The biggest issue I think, is heat dissipation, and the effects of the electronics being constantly on.
http://forums.thecustomsabershop.com...ead.php?t=5222
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