12)Next cut the 2nd loop, and un-twist the twisted section near the toroid body.
13)Similar to step 11; the wire which came over the toroid body has five turns then goes
into hole 4, which you did in step 11. Insert this wire-end into hole 3.
The other wire end that came from under the toroid body should be gently pushed
toward the toroid, and pulled up through the center hole of the toroid. Insert that wire
end into hole 8. So now you have the “primary” winding consisting of five turns,
between holes 3 and 4.
Twist the two new wires under the board again, to keep everything in place.
14)Finally, cut and un-twist the loop which you created first, which was between the
38th and 39th turns of the toroid winding. Push the wire which came over the toroid
body, into hole 7. Now you have five turns of wire, which make up “secondary 2”,
between holes 7 and 8.
15)The last wire came from under the toroid body when you cut the loop; this wire is the
other end of the 38 turns “secondary 3” winding, so insert it into hole 1. It is already
near to hole 1 and you don’t need to push it under the toroid body as you did in
previous steps.
Take a moment now to review the situation. You should be able to identify the four
windings of T1, and squeeze them together neatly as in the photo, to verify that each
end of the 5-turn windings goes into the correct holes.
16)Under the PCB, you should have three pairs of twisted wires, and one pair (that you
installed last), un-twisted.
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