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Old 23rd August 2012, 03:34 PM   #1
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Default Need help with coils in serial connection

Hello,
I'm interested if anyone knows is there a difference in sound in a serial connection of two coils (Mundorf CFC14 0,22uH + Mundorf CFC14 0,10uH) compared to one of larger value (Mundorf CFC14 0,32uH).
Thanks.
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Old 23rd August 2012, 06:56 PM   #2
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DCR of two coils in series will not be the same as one coil.
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Old 23rd August 2012, 10:07 PM   #3
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perhaps no difference.

The DCR will be the sum of the two coils vs the DCR of the greater number of turns for the larger coil. Might be identical. Turns is turns. The specs may be published. Either way a trivial difference compared to bumping up to a fatter wire gauge.

What may make a difference is mutual coupling between the two coils depending on how you lay it out. But if they are in the same axis, or some distance apart there should be nil difference. Having them inadvertently in opposition will reduce the inductance.

I wouldn't waste any time or effort worrying about it.

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Old 24th August 2012, 11:45 AM   #4
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Thank you.
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Old 24th August 2012, 09:07 PM   #5
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You can look at f.ex. this Madisound table and see that the DCR for two smaller coils in series do not add up to the DCR of one larger coil. Turns ain't always turns....

If you mount the two smaller coils so that they mutually couple, then the total inductance will be larger than their individual values.

Last edited by Andersonix; 24th August 2012 at 09:10 PM.
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Old 24th August 2012, 09:21 PM   #6
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Can you point out on that table where you come to that conclusion?
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Old 24th August 2012, 09:32 PM   #7
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Quote:
Originally Posted by vcanzi01 View Post
Hello,
I'm interested if anyone knows is there a difference in sound in a serial connection of two coils (Mundorf
CFC14 0,22uH + Mundorf CFC14 0,10uH) compared to one of larger value (Mundorf CFC14 0,32uH).
Thanks.
Hi,

There should be no difference, but if the 0.1 is not ~
half the size of the 0.22 you are wasting money.

rgds, sretern.
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Old 24th August 2012, 10:11 PM   #8
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Quote:
Originally Posted by Andersonix View Post
You can look at f.ex. this Madisound table and see that the DCR for two smaller coils in series do not add up to the DCR of one larger coil. Turns ain't always turns....

If you mount the two smaller coils so that they mutually couple, then the total inductance will be larger than their individual values.
The thing is that I bought 4 pcs of CFC14/0,22uH and now i need for my other project values of 0,32uH.
If i can connect them in series 0,22+0,10=0,32uH and without loosing sound quality i will do it. The RDC of 0,10uH is 0,07Ohm, 0,22uH is 0,11Ohm.
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Old 25th August 2012, 03:20 AM   #9
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Take f.ex. 0.1mH (0.10R) + 0.2mH(0.14R) = 0.3mH(0.16R)

The DCR of the two smaller coils added (without regard for coupling effects) is 0.24R, so a bit larger than 0.16R of the single larger coil.
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Old 25th August 2012, 11:29 AM   #10
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OK I see what you are saying now, misunderstood what you were saying. Yes, individual coils will have more wire on them compared to a single coil of the same total inductance.
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