Toroid Transformer Vertical or Horizontal Mounting - diyAudio
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Old 3rd October 2012, 09:36 AM   #1
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Default Toroid Transformer Vertical or Horizontal Mounting

Hello,

I am Building a Stereo power amp (Class A) using two identical transformers (400VA Each), Each trans for each channel. Obviously Size is the issue, i need to make the Chassis as Slim as possible, so mounting the Transformer vertically makes a big difference & gives me lots of space inside the chassis aswell. I do see lots of Plus in mounting they vertically but are there any Minuses?

So, which is the best mounting method for toroid Trans, with which we (DIYers) may be able to avoid Humm, Crosstalks, interference and any other problems faced on DIY pojects because of Toroidal transformers.

Also i would like to ask, Which sections of a Toroidal transformer has lots of Electromagnetic Wave Emmitance, Top/Bottom or Side (Outer Diameter)

Any Help or Recommendation will be deeply appreciated.

Thanks & Best Regards.
SLAK
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Old 3rd October 2012, 09:50 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Click the image to open in full size.

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on these pics "sponge rubber " strips are important parts

consider entire toroid as magnetic field emanating object
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Old 3rd October 2012, 11:04 AM   #3
balerit is offline balerit  South Africa
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The only worrying thing is the steel bolt going thru the transformer connecting the bracket and the casing.
Mac
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Old 3rd October 2012, 11:42 AM   #4
DUG is offline DUG  Canada
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Horizontal vs Vertical: The only difference is going to be the weight of the bracket in your amp.

Toroids are self shielding in that there is no definite gap to form a magnetic field across.

If you are concerned about stray field you can put a shield over the whole toroid, but make sure you do not make a complete conduction path through the toroid. i.e a complete loop. This would be like a shorted secondary winding. not good
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Old 3rd October 2012, 12:37 PM   #5
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Quote:
Originally Posted by Zen Mod View Post
consider entire toroid as magnetic field emanating object
Thanks a Lot for the Pics.
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Old 3rd October 2012, 12:38 PM   #6
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So, How about making a Barrier between the Amp Boards & the transformer, just like i have shown in the virtual images I made below.
Making a 1mm Steel or a 5mm thick Plastic wall/barrier between the transformers & the Amp boards. Also covering this wall with a thin layer of Leather. Will this method do any Good to shield the amp boards from Electromagnetic waves being emitted from the transformers? Or is it a waste of time to make these Barriers?
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Last edited by SLAK; 3rd October 2012 at 12:59 PM.
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Old 3rd October 2012, 01:02 PM   #7
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I'd use 3mm steel. I suspect 1mm won't make much of a difference, 5mm plastic I'd be surprised if it had any effect at all I can't see any reason the leather would help but if you have a theory on that I'm all ears! I used lead for a shield on my torroid years ago, which did have an effect but not as much as I would have liked, I since found out that steel is a much better attenuator for EMI.

Tony.
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Old 3rd October 2012, 01:12 PM   #8
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I'd use 3mm steel. I suspect 1mm won't make much of a difference, 5mm plastic I'd be surprised if it had any effect at all I can't see any reason the leather would help but if you have a theory on that I'm all ears! I used lead for a shield on my torroid years ago, which did have an effect but not as much as I would have liked, I since found out that steel is a much better attenuator for EMI.

Tony.
Hello,
To be Honest i did not come up with the Leather theory. Its just that not long ago i had opened up a Hi-End Amplifier (Chinese) the toroid transformers were contained in a special Round enclosure, i think steel was the material of the enclosure about 1mm thick & the outer surface of the enclosure was completely covered with some sought of leather material. I thought maybe the leather covering meant something.
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Old 3rd October 2012, 01:26 PM   #9
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It could be used as an insulator to ensure that there isn't a shorted turn.

Tony.
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Old 3rd October 2012, 01:41 PM   #10
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Quote:
Originally Posted by wintermute View Post
It could be used as an insulator to ensure that there isn't a shorted turn.

Tony.
Yes, Maybe.

Quote:
Originally Posted by wintermute View Post
I'd use 3mm steel. I suspect 1mm won't make much of a difference.
In that case i will have to drop my plan to even make a barrier, Cutting a 3mm Steel Plate as per the required dimension seems a time consuming & a expensive process (using laser cutting method).
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