I have a center tap transformer that does 110 or 220VAC stepdown to two 6V rails (with opposing phases). On the 110/220 side there are what appear to be two separate rails, and the wiring diagram is a bit confusing to me:
In order to use this on a 110VAC source and get the proper 6VAC output, how do I wire up the mains side? Per the diagram it seems like I would wire the mains to a single black/red set (with the other set tied off and insulated), or possibly tie them in parallel (black to black, red to red). Is the idea that for 220VAC input I'd tie the center black and red together and wire the 220 mains to the outer pair of wires?