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Old 16th May 2008, 10:20 PM   #1
Nordic is offline Nordic  South Africa
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Default Some questions about schematic symbol

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Can you tell me what the little dots mean at the transformer...?

I have never wound a transformer before, much less made a switchmode supply, but I would like to try..

Also what would be a suitable wire thickness... max Vout will be about 260VDC but probably well under 10mA.
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Old 17th May 2008, 01:00 AM   #2
SY is offline SY  United States
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Polarity. If the end of the dot on one winding goes positive, the end of the other winding will also go positive.
A philosopher is a blind man in a dark room looking for a black cat that isn't there. A theologian is the man who finds it. - Mencken
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Old 17th May 2008, 07:47 AM   #3
luka is offline luka  Slovenia
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Hi (<--Coupled inductors)

Also look for Coupled inductors on google
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