In article ,
"Dave" wrote:

Gotcha! (I think.) So I should wind half my turns with A to a, then
connect a to B and wind the other half. Have I got that right? Or do I
Wind A to a and then wind B to b over that (not actually connecting one to
the other), using B as my CT?

Dave-

How critical is your center tap? If it important that the tap be
perfectly centered, it would be better to use one bi-filar winding
instead of the two separate windings you describe.

If possible, spread the turns out over the toroid so the end is next to
the beginning, so the center tap can be easily connected.

If there are a lot of turns using small wire, you can first wind the
wire pair onto a shuttle (a long, skinny flat spool). Then unwind it
from the shuttle while passing it through the toroid. With lots of
turns, it might help if the two wires were different colors. Otherwise
you would need an Ohmmeter to determine which is which.

Fred
K4DII