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Old 1st July 2006, 01:26 PM   #1
Nixie is offline Nixie  Canada
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Default R-core

How do you wind on an R-core?
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Old 1st July 2006, 01:47 PM   #2
BWRX is offline BWRX  United States
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Maybe a picture will help.

http://www.lenco-elect.com/r_core_transformers.htm

Primary on one side, secondary on the other.
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Old 1st July 2006, 01:51 PM   #3
poobah is offline poobah  United States
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With a machine like a toroid winder...
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Old 1st July 2006, 01:57 PM   #4
Nixie is offline Nixie  Canada
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Wait, I just got it... the core is round cross-secion, you could simply spin the bobbin... much easier than a toroid, this is actually DIYable.

These are supposed to have lower EMI than toroids, EI, and split-cores. I'm just wondering how their bandwidth is. I usually use EIs not because they're cheaper, but because they provide better isolation from mains crap. I'd be curious to know how the R-cores rate on that issue.
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Old 1st July 2006, 02:08 PM   #5
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Isolation is bound to be good because of the separated coils. I wouldn't put much faith in the claims of lower EMI than a toroid.
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Old 1st July 2006, 02:36 PM   #6
Nixie is offline Nixie  Canada
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The lower EMI makes sense, actually, due to the winding arrangement and shape.

The disadvantage vs. toroids of these actually is that they are larger for the same VA rating.
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