The first step is to feed the wire from underneath the toroid, as shown in the picture.
The coil is wound anti-clockwise, as shown in the picture. The wire is slightly shifted to the right as it passes on top of the toroid (2,3).
EACH TIME THE WIRE PASSES THROUGH THE CENTER OF THE TOROID, IT COUNTS AS ONE TURN.
The previous step is repeated. Whenever the wire is passing through the centre of the toroid, it counts as a turn (Refer to the next step 3b to see the coil from a different angle).
The picture shows a total of 2 turns.
This is also 2 turns as per the previous step as shown above, but viewed from underneath the coil.
The picture shows 3 turns.
This is 4 turns. Again, whenever the wire is passing through the centre of the toroid, it counts as a turn.
This toroid has 11 turns.
Do not pull the wire too tight.
Do not put the toroid in vice as the toroid can shatter or crack - hold it by hand.
This is the last step in the tutorial. After coiling the wire 11 times as shown in the picture, we need to focus on the SPACING OF THE LEADS AROUND THE TOROID.
Make sure that the windings are spaced as evenly as possible on the core, covering 75-85% of the core.
Please note: The spacing of the windings does affect the inductance of the toroid: spreading the turns will increase the inductance and compressing the turns will decrease the inductance.