How to wire inductor - s and n

matthew2456 · 21st January 2007, 06:46 PM

Have a james choke with s and n connections.

which is which?

Thanks

matthew2456 · 22nd January 2007, 04:28 PM

bump

pmillett · 22nd January 2007, 05:53 PM

As far as I know, it doesn't matter.

Pete

matthew2456 · 22nd January 2007, 08:23 PM

Ok thanks, just want to make sure.

Here is the spec sheet if anyone else can shed some light on it.

Thanks

bambadoo · 21st May 2011, 08:38 AM

Came across this. I have a couple of these inductors also. js-4016b

1. Is it possible to use it as a "dual choke". in ie. clclc filter? with 2.5H each section?

2. For 10H operation. Connect N1 and S2? And us S1 and N2 for "choke operation"?

Thanks in advance

Sincerely

DF96 · 21st May 2011, 12:49 PM

As far as I can see S and N just identify the winding sense. You need to know this when connecting the windings together, either in parallel or series. Apart from that they have no significance. For 2.5H connect N1 to N2, S1 to S2. For 10H connect N1 to S2, or N2 to S1.

If you try to use the two windings in separate parts of a circuit (even closely related parts such as successive L's in a CLCLC filter) this will not work because they are strongly coupled - you won't have two separate chokes but one transformer.

Rundmaus · 21st May 2011, 02:42 PM

Quote:

Originally Posted by DF96

If you try to use the two windings in separate parts of a circuit (even closely related parts such as successive L's in a CLCLC filter) this will not work because they are strongly coupled - you won't have two separate chokes but one transformer.

Right. But one might use them as a common-mode choke in both conductors (0V and B+) of the PSU...

Greetings,
Andreas

DF96 · 21st May 2011, 05:07 PM

Why would you want a 2.5H common-mode choke? It would probably have far too much parasitic capacitance to block HF noise.

Magz · 22nd May 2011, 04:15 AM

Quote:

Originally Posted by DF96

Why would you want a 2.5H common-mode choke? It would probably have far too much parasitic capacitance to block HF noise.

Lundahl recommends wiring their dual coil chokes for "improved common mode rejection" by placing one coil in the + and one in the - of the circuit. See link:

http://www.lundahl.se/pdfs/datash/1638.pdf

Rundmaus · 22nd May 2011, 09:18 AM

Quote:

Originally Posted by Magz

Lundahl recommends wiring their dual coil chokes for "improved common mode rejection" by placing one coil in the + and one in the - of the circuit.

Hi DF96,

that's what I had in mind... Must have read it when I was on the Lundahl website looking for my OPT's.

"Common-mode choke" was a bit wrong, as this usually stands for RF suppression chokes as you already said.

Greetings,
Andreas

21st January 2007, 06:46 PM	#1
matthew2456 diyAudio Member Join Date: Aug 2004 Location: SW - UK	How to wire inductor - s and n Have a james choke with s and n connections. which is which? Thanks

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22nd January 2007, 04:28 PM	#2
matthew2456 diyAudio Member Join Date: Aug 2004 Location: SW - UK	bump

22nd January 2007, 05:53 PM	#3
pmillett diyAudio Member Join Date: May 2005 Location: Dallas (but I am not a Texan!)	As far as I know, it doesn't matter. Pete

22nd January 2007, 08:23 PM	#4
matthew2456 diyAudio Member Join Date: Aug 2004 Location: SW - UK	Ok thanks, just want to make sure. Here is the spec sheet if anyone else can shed some light on it. Thanks

21st May 2011, 08:38 AM	#5
bambadoo diyAudio Member Join Date: Feb 2003 Location: West Coast of Norway	Came across this. I have a couple of these inductors also. js-4016b 1. Is it possible to use it as a "dual choke". in ie. clclc filter? with 2.5H each section? 2. For 10H operation. Connect N1 and S2? And us S1 and N2 for "choke operation"? Thanks in advance Sincerely

21st May 2011, 12:49 PM	#6
DF96 diyAudio Member Join Date: May 2007	As far as I can see S and N just identify the winding sense. You need to know this when connecting the windings together, either in parallel or series. Apart from that they have no significance. For 2.5H connect N1 to N2, S1 to S2. For 10H connect N1 to S2, or N2 to S1. If you try to use the two windings in separate parts of a circuit (even closely related parts such as successive L's in a CLCLC filter) this will not work because they are strongly coupled - you won't have two separate chokes but one transformer.

21st May 2011, 05:07 PM	#8
DF96 diyAudio Member Join Date: May 2007	Why would you want a 2.5H common-mode choke? It would probably have far too much parasitic capacitance to block HF noise.

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