In all cases, there is one long secondary winding, and three other short identical windings.
To make things easier, we will wind all windings together in one go, this will guarantee that
the “sense” of each winding will be the same. At the intended breaks between the windings,
we will leave large loops of wire, that we can later cut one by one to make sure the wires go
in the correct holes.
There are a lot of steps listed below but in reality, it is easier DOING it than it is writing
instructions how to do it. Take it patiently, step by step.
1) Hold the toroid between thumb and finger, and thread the first turn of the wire
through from top to bottom. Leave about 3cm of wire at the free end.
2) Apply tension to the wire after each pass through the center hole, to try to keep the
windings tight and even. The wire turns should sit neatly side-by-side on the toroid,
without overlapping.
3) Grip the toroid between thumb and finger as you wind.
4) When you have completed 38 turns, pass the wire through the hole for the 39th turn
but leave a large loop of wire between the 38th and 39th, without pulling it tight.
5) Grip the toroid and wound turns tightly between thumb and finger, and with the other
hand apply some twists to the wire loop, tight next to the toroid.
6) The result is a wire loop after 38 turns, as shown.
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