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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: Re: E-I core transformers should not run that hot. posted by EvilSeav on April 24, 2007 at 21:18:19:
There is a lot of debate about whether toroids are better or worse than E-I core transformers for audio.Toroids are more efficient and have a wider bandwidth. Thus, they are smaller for a given application and can respond more quickly. The wider bandwidth may not be a good thing if they pass RF noise more effectively than the equivalent E-I core designs.
Charles Hansen of Ayre has posted several times on his choice of the E-I core designs in part to improve isolation from RF noise. Other designers have told me the same thing.
Another problem with toroidal power transformers is their low primary winding resistance. This allows them to be saturated more easily by "DC" on the AC line (from appliances that cause waveform distortion, such as hair dryers) and to hum loudly while the "DC" is present.
The wider bandwidth of toroids makes the Paul Speltz ZERO autotransformer a good device for coupling low-impedance speakers to modest amplifiers. Their smaller size allows more powerful amplifiers to be compact.
You should definitely look into the ventilation, as restricted air flow will kill most electronic components, not just transformers. If you are sure your current demands are low, then the transformers may be getting hot due to core losses. This might be an advantage if it results in better isolation from RF noise.
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Follow Ups
- Big can of worms! - Al Sekela 11:10:21 04/25/07 (2)
- One correction - Charles Hansen 11:43:42 04/28/07 (0)
- Yes, torroids are NOT all angel. - cheap-Jack 12:16:41 04/25/07 (0)
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