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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Question about Using Low DCR Power Xfrmrs in amp circuits posted by Ian L. on October 12, 2002 at 16:23:57:
Hi Ian,I think that when people suggest looking for a low DCR secondary, they really mean they are looking for a power transformer with low temperature rise and good regulation. As MQRacing so aptly explained, low DCR isn't by itself a measure of quality. A good power transformer is unlikely to have high DCR, but it takes more than low DCR to make a good power tranny!
The true goal, a power supply with low output impedance, is truly worthwhile. If a power transformer has good regulation, the ouput voltage will be close to the nominal value even when there is little or no load. Since it is often hard to find a power transformer with good regulation, sometimes people look instead for a transformer that has excess current capacity and a low-DCR secondary, in order to lower the supply's output impedance. Unless the transformer also has good regulation, the output voltage will be too high. The other unfortunate side effect is too much fluctuation of the output voltage as the load changes.
Gary Dahl
Edits: 07/12/20 07/12/20
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Follow Ups
- Re: Question about Using Low DCR Power Xfrmrs in amp circuits - gdahl 15:12:28 10/17/02 (0)
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