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If you're talking about which way to run your wires under the table, then it doesn't matter one bit. Physically seperating AC from DC only matters in ultra-sensitive circuits... I was going to run all my wires back to the control panel and do the connecting there, i.e. both leads of each LED, all three leads of the turnouts, each buildings lights, some buildings with more than one circuit for lighting (so they can be switched on and off in seperate offices so it looks like there is some activity in that building) signalling, sensors... Making sure I Iabel each every well so I can figure what I have when I'm done. Selecting a color scheme for the wiring will help a lot, i.e. for each LED use red and black wire, the red ALWAYS on the anode; for each turn out using blue, yellow and green, always using yellow for the common, black for 'straight' and red for 'turn'... As for you using the Hogwarts power pack to do this, are you still planning to use it to run your train? If your are the LEDs will change brightness with the speed of you train. I'm doing something similar, but using one power pack that came with the sets to power the accys and using two other power packs to run the trains (one for the skyway express and the other for the switchyard. scada
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