R-core

Nixie · 1st July 2006, 02:26 PM

How do you wind on an R-core?

BWRX · 1st July 2006, 02:47 PM

Maybe a picture will help.

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

Primary on one side, secondary on the other.

poobah · 1st July 2006, 02:51 PM

With a machine like a toroid winder...

Nixie · 1st July 2006, 02:57 PM

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.

poobah · 1st July 2006, 03:08 PM

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.

Nixie · 1st July 2006, 03:36 PM

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.

1st July 2006, 02:26 PM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	R-core How do you wind on an R-core?

1st July 2006, 02:47 PM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Maybe a picture will help. http://www.lenco-elect.com/r_core_transformers.htm Primary on one side, secondary on the other. __________________ Brian

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1st July 2006, 02:51 PM	#3
poobah diyAudio Member Join Date: Nov 2005	With a machine like a toroid winder...

1st July 2006, 02:57 PM	#4
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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.

1st July 2006, 03:08 PM	#5
poobah diyAudio Member Join Date: Nov 2005	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.

1st July 2006, 03:36 PM	#6
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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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