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UV101 5th January 2013 07:27 PM

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 :D

http://i497.photobucket.com/albums/r...EC357C67B3.jpg

DUG 5th January 2013 11:10 PM

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.

UV101 6th January 2013 04:52 PM

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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