Electronic – Wiring up 110/220VAC to 6V center tap transformer

actransformer

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:

Two black/red rails on left, 6/0/6 center-tap rails on right

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?

Best Answer

Your understanding is correct.

schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Primary and secondary windings.

Note that the voltage between the two blue terminals will be 12 V AC.

You could use only one primary for 110 V operation but the maximum power you can draw from the transformer would be halved.

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