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DIY Audio Analyzer with AK5397/AK5394A and AK4490
DIY Audio Analyzer with AK5397/AK5394A and AK4490
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Old 1st January 2019, 08:55 PM   #2531
etlasr is offline etlasr  United Kingdom
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Join Date: Jun 2012
Location: Brighton UK
Default XFR spurious coupling issue?

If I have got the hang of how to upload attachments this should show 3 pics of the mains XFR as factory fitted,vertically up against back panel and hanging outside of side panel. Significant differences.
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File Type: pdf rtx various XFR locations.pdf (960.3 KB, 109 views)
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Old 1st January 2019, 11:52 PM   #2532
1audio is offline 1audio  United States
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DIY Audio Analyzer with AK5397/AK5394A and AK4490
For magnetic induced hum fields shorting the input would be worst case since the current flows without limit. I mentioned earlier we need to find a steel (or mumetal) can we can put the transformer in. I think its too big for a tuna can and those aren't steel any more I think. . . Do you have the dimensions of the transformer? There are can's on eBay that might work.
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Old 2nd January 2019, 09:33 AM   #2533
etlasr is offline etlasr  United Kingdom
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Default XFR spurious coupling issue?

I have already tried a pretty thick(gauge) umetal 'collar' enclosing the XFR and protruding above the XFR height with XFR in its factory location as an 'easy fix'. Its not a fully enclosed can of course but thought it would be indicative of the way to go but it didn't have much effect hence then experimenting with the XFR location.

I'm of the school that says careful design of magnetics and their locations is very important (I have designed high power magnetics in aerospace SMPSs) but the best and cheapest / free way to get significant improvements is distance.
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Old 2nd January 2019, 10:06 AM   #2534
JensH is offline JensH  Denmark
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DIY Audio Analyzer with AK5397/AK5394A and AK4490
The diameter of the transformer is specified as 72 mm. The height is just over 40 mm.
I can see that protective covers with dimensions of 80x40 mm with an iron thickness of 1 mm are available. They might be suitable for testing. I have no idea about the shielding effect though.
Please remember: do not short circuit the transformer with the shield and mounting!

I have ordered a small number of transformers with magnetic shielding (GOSS band) and lower flux.
My intention is to compare the magnetic fields from this transformer and the original transformer. The diameter will increase to around 75 mm and the height will increase as well.
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Old 2nd January 2019, 12:12 PM   #2535
etlasr is offline etlasr  United Kingdom
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JensH. Yes a good reminder to be sure any experiments do not result in a shorted turn.

Out of interest I have just tried sitting the XFR in a steel tuna can with XFR in its factory location. Top is open but as an experiment it showed little improvement. An admittedly poor fit lid fashioned from mu metal (so XFR was crudely fully enclosed with gap for lead outs) also didn't help materially. Tuna can thickness isn't much but then a previous experiment with a reasonably think mu metal collar around the XFR didn't help much either. Intriguing.
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Old 3rd January 2019, 04:33 AM   #2536
nyt is offline nyt
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Join Date: Dec 2010
Quote:
Originally Posted by JensH View Post
The diameter of the transformer is specified as 72 mm. The height is just over 40 mm.
I can see that protective covers with dimensions of 80x40 mm with an iron thickness of 1 mm are available. They might be suitable for testing. I have no idea about the shielding effect though.
Please remember: do not short circuit the transformer with the shield and mounting!

I have ordered a small number of transformers with magnetic shielding (GOSS band) and lower flux.
My intention is to compare the magnetic fields from this transformer and the original transformer. The diameter will increase to around 75 mm and the height will increase as well.

Interested in how this turns out. If you find a good result, please let us know where we can get the transformer.


Cheers
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Old 3rd January 2019, 11:38 PM   #2537
mbrennwa is online now mbrennwa  Switzerland
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Quote:
Originally Posted by etlasr View Post
...the best and cheapest / free way to get significant improvements is distance.
Is there any reason to not do this here? How about an external transformer that sits far away outside of the RTX box, connected to the RTX with a long wire?
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Old 4th January 2019, 07:44 AM   #2538
JensH is offline JensH  Denmark
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If it is done correctly and the safety aspects are handled correctly, I don't see any technical problems in doing it. Make sure that it is done in a safe way to avoid any safety hazards. And use the correct wire gauge with stable connections.
You will of course void the warranty if still in force.
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Old 4th January 2019, 03:57 PM   #2539
etlasr is offline etlasr  United Kingdom
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As JensH says putting XFR externally (in a steel box ideally) is straight forward but you must get the safety aspects correct for the external box and you also need to consider how to ground the RTX as the ground connection wont be into the RTX via the IEC connector. Can be done as a temporary fix such that the factory config is readily reinstated if required.
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Old 5th January 2019, 09:06 PM   #2540
Pinebox Studio Servi is offline Pinebox Studio Servi  United States
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Anyone running this on Mac and if so what program are you using?
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