>I had done the math on this a while back and figuring that each
>station will take 30-50 mA, I can't really send 5V along the lines.
...
>So I'm leaning towards 12V and plain jane 7805's.

At that rate I would suggest looking at some of the small switching
regulators around. Linear Technology have some small ones which need just an
inductor and capacitor IIRC, but it is a while since I looked at them.

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