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Old 21st January 2007, 06:46 PM   #1
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Default How to wire inductor - s and n

Have a james choke with s and n connections.

which is which?

Thanks
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Old 22nd January 2007, 04:28 PM   #2
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bump
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Old 22nd January 2007, 05:53 PM   #3
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As far as I know, it doesn't matter.

Pete
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Old 22nd January 2007, 08:23 PM   #4
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Ok thanks, just want to make sure.

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

Thanks

Click the image to open in full size.
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Old 21st May 2011, 08:38 AM   #5
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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
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Old 21st May 2011, 12:49 PM   #6
DF96 is offline DF96  England
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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.
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Old 21st May 2011, 02:42 PM   #7
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Quote:
Originally Posted by DF96 View Post
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
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Old 21st May 2011, 05:07 PM   #8
DF96 is offline DF96  England
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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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Old 22nd May 2011, 04:15 AM   #9
Magz is offline Magz  United States
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Quote:
Originally Posted by DF96 View Post
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
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Old 22nd May 2011, 09:18 AM   #10
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Quote:
Originally Posted by Magz View Post
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
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