Transformer coil winding.
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Previously:
https://www.homemadetools.net/forum/...268#post188449
https://www.homemadetools.net/forum/...983#post171817
https://www.homemadetools.net/forum/...259#post184927
https://www.homemadetools.net/forum/...644#post178296
https://www.homemadetools.net/forum/...904#post160170
