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Old 5th January 2013, 07:27 PM   #1
UV101 is offline UV101  England
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Default Transformer windings...

In sure this has been discussed previously but I can't find any info (bit more difficult using tapatalk).

What's the general consensus on adding additional windings to toroidal transformers???

I have a 2 x 12v 30va that I'm using for the analogue output stage in my CDP. As I wanted to remove the original transformer , I needed an independent 4.3vAC winding. I tried a few wraps of thin insulated wire on the toroid and worked out that I needed about 46 wraps. I spaced them evenly around the core and got what I wanted.

I'm sure I've broken many cardinal rules but I'm very kean to learn.......

You can see the white insulated additional winding in the picture

Click the image to open in full size.
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Old 5th January 2013, 11:10 PM   #2
DUG is offline DUG  Canada
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How many VA total draw for the entire core?

If it does not exceed the 30VA rating and does not compromise the primary to secondary isolation/breakdown ratings then I don't see a problem.
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Old 6th January 2013, 04:52 PM   #3
UV101 is offline UV101  England
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The transformer was over rated in any case so I can't see that a few VA for the display will be an issue. Just wanted to make sure I was doing it "right"
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