Transformer windings...

UV101 · 5th January 2013, 07:27 PM

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

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"

5th January 2013, 07:27 PM	#1
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	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 __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

5th January 2013, 11:10 PM	#2
DUG diyAudio Member Join Date: Jan 2003 Location: mississauga ontario canada	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. __________________ Doug We are all learning...we can all help

6th January 2013, 04:52 PM	#3
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	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" __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

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