Winding Toroids Phasing

H

Hammy

Guest
I'm constructing a multiple output flyback transformer using a Toroid.
My input voltage is 12V to 20V output is 5, 12 and -12, Po = 7W.

My question is about the phasing. See picture

http://i49.tinypic.com/a5f614.gif

Referring to step one of the picture for the primary side, if I start
where "start" is and pull the wire through from start (left) to right
does that make the "start" side the DOT. I'm putting 12 turns on the
primary.


All I have is standard electrical tape should I bother using it or
will it reduce coupling? I'm using insulated magnet wire.

My secondary turns are 4,5 and 9. The 5V and 12V are DC stacked and
will be bifilar tap.

Should the secondary windings start on the same side or does it
matter?
 

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