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Old 14th September 2012, 03:58 PM   #1
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Default Toroidal Transformer additional windings

Hi all.

I have a toroidal transformer with two secondary windings, each giving a 38V output. I will connect these in series to give me +38V, 0V and -38V. I am just wondering if anyone knows if it is possible to add extra windings over the top of the insulating layer of the toroid, from the 0V point, to give, say, +/- 15V? I would use this for an op amp in the preamp stage. Is this a possible way? Or am I completely heading in the wrong direction?

Thanks.
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Old 14th September 2012, 04:17 PM   #2
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Yes, it is possible., I did that in this design: AudioSector-chip amp kits, dacs, chassis and it worked perfectly fine.
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Old 14th September 2012, 06:41 PM   #3
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Thanks for your reply, I will give it a go then!
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Old 15th September 2012, 08:24 AM   #4
AndrewT is offline AndrewT  Scotland
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0.6mm diameter enameled copper is perfect for low current windings.
The 0.28sqmm can give upto 0.9Aac of continuous output.
That would be ~400mAdc of continuous current after the bridge rectifier and ~1mF of smoothing.

0.6mm is easy to straighten and to wind. A 500gm reel has a lot of metres on it for many projects. It even makes very good air cored inductors to experiment with CLC supplies.
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Old 15th September 2012, 11:50 AM   #5
AJT is offline AJT  Philippines
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if the middle of your torroid is potted, you will have to remove it first...wind a test coil of say ten turns to determine the turns per volt...since volts/10 helps you with the number of turns required,.....

if you want +/-15volts i assume that that is regulated so you will need at least 15-0-15volt ac winding....wire will be small so that you can do bifillar winding.....
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