That's simple to do. Feed in about 20 wires. Hook ten in series and the other 10 in paralllel. You then have a 10:1 transformer with very tight coupling. Its not worth the bother at 60Hz though.
Can't wind simultaneously or you'll never meet regulatory safety specs. Creepage / clearance distances etc...
Ohhhh - unless you use triple insulated wire maybe. But that's kind 'niche'.
Splitting windings into multiple layers is good for efficiency in HF SMPS designs.
Graham
Did you take one apart and look ?
Did you think about the most common use of a transformer - which is to change a voltage from one level to another - eg 110 volts in to 12 volts out ? To do this , you have to have a primary with one number of turns, and a secondary with a different number, in the ratio ( roughly ) of the voltages. So how would you do this with a common multi-wire feed ?
Generally speaking, are _split windings_ in commerical transformers wound one complete winding on top of the other, ie. from a single wire feed, or are the windings wound simultaneously from a multi-wire feed?
Thanks for any insight.
Les
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