If you intend to use the PWM code, the board will take either 0.5A (or so) if you are not using the on-board LEDs, about 1A if you are. In either case you should provide externally regulated DC power to the board. You can bring it in through the RJ45 jacks on pins 7/8, although you must bring in the zero-crossing some other way. You probably cannot use the on-board regulator in this situation (most likely you will have power dissipation problems with the regulator). To bring in power through the RJ45 connector you should install a jumper in place of D1, and another jumper across the outer two pins (1,3) of the regulator U1.
If you are using the non-PWM code, the board will require around 100 mA of current. In this case you can either do the same thing as above, or you should be able to use Wayne's transformer board (or some equivalent method) to provide power to the regulator. Instructions for this are in the wiki.
Well, I'm not sure what you mean when you say 'thing-a-ma-bob'.
The transformer board can provide power, zero-crossing and input serial signal through the RJ45 connector (although only enough power for the non-PWM firmware). It's more complicated if you want to use the PWM firmware.
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