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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: better magnet wire, better transformer? posted by Slawney on September 20, 2005 at 09:07:40:
Slawney:If you are going to focus particularly on the noise issues, I don't think that the wire of the transformer windings is the most productive area to consider. Although noise on the AC powerlines _can_ be coupled into the power circuitry, the most typical mechanism of coupling is the inter-winding capacitance, something that your R-core transformer - with its separate and physically distanced bobbins for primary and secondary windings - doesn't have much of. IOW, the R-cores are pretty good at not coupling AC powerline noise into the subsequent circuitry. A more problematic source of noise is likely to be present right within the audio component itself, in the form of the switching action of the rectifiers (which can take the form of radiated as well as conducted noise) and the resonance of the transformer windings.
To reduce power-circuitry-related noise within the audio component, I'd suggest rectifiers that don't have any minority carriers (i.e., Schottkys), and snubbing networks on the transformer's secondary windings to tame ringing of the same. And as a more extreme measure, choke power supplies (this shouldn't be too difficult to implement with the digital circuits, but it won't be so easy with the power amp).
You are, of course, free to rewind the transformers, and you may even be able to hear and measure some benefits if you do this. Nonetheless, I think that it will be more productive to deal with the rectification noise issues first and then look at the winding material only if you are still not satisfied.
diplomatically yours, jonathan carr :-)
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Follow Ups
- Re: better magnet wire, better transformer? - jcarr 11:25:58 09/21/05 (2)
- Re: better magnet wire, better transformer? - pkell44 16:19:04 09/22/05 (0)
- Re: better magnet wire, better transformer? - john curl 12:17:15 09/21/05 (0)
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