300W SMPS for amp. from PC PSU

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OK,
I think I get it.

The whole primary must be in one long winding.
The sections contain a part of that long winding.
All the current in the primary winding MUST pass through each section.

Similarly, the whole secondary is considered as one long winding.
The current in that long winding MUST pass through each section.

The alternative that I was thinking about was for a secondary that required 6parallel wires and a total of 26Turns was:
2 wires and 26T in section one,
2 wires and 26T in section two,
2 wires and 26T in section three.
Parallel the three sections to give 6wires and 26Turns.

If I now understand correctly, this is not an acceptable way of interleaving the secondary winding.
 
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