Wiring LM3886 - Page 2

frank1 · 21st January 2011, 07:11 PM

Quote:

Originally Posted by LAJ

that stranded is better than solid.

You heard wrong!

frank1 · 21st January 2011, 07:13 PM

Quote:

Originally Posted by suntechnik

Theoretically current can go from one strand to another strand making many different pathes through strand surface that could vary total wire resistance withing short period of time that can be considered like noise. How it can affect sound in a real device questionable of course.

Solid wire means being on a safe side. Litzendraht is another extreme.

I vote for solid as well.

This is utter rubbish. Sorry
Litz wire is not the same as stranded. Each strand is insullated.
Don't forget, we are talking about AUDIO frequency here NOT RF.

suntechnik · 21st January 2011, 07:24 PM

Quote:

Originally Posted by frank1

Litz wire is not the same as stranded. Each strand is insullated.
Don't forget, we are talking about AUDIO frequency here NOT RF.

Absolutely agreed!

tangmonster · 22nd January 2011, 05:42 AM

How big is skin effect at audio frequencies?

pacificblue · 22nd January 2011, 06:41 AM

Negligible. Especially for a length of 20 cm.

liquias · 22nd January 2011, 07:01 AM

Please consider this link:

American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies

Due to skin effect I too always knew stranded is better ...
Also I have seen allot of very professorial speaker cables which are stranded and I have never seen any solid conductor speaker cable.

How come skin effect is negligible ?
And what does skin effect has to do with a wire's length ?

Urgon · 22nd January 2011, 07:16 AM

AVE...

1.5mm stranded wire will be enough...
At audio frequencies skin effect can be ignored - in case of stranded wire each strand will conduct the current with it's whole diameter...
You will hear the difference because the original wire you used was too thin and had considerable resistance and voltage drop across it's length. Next time consider the maximum current flowing through the cable and select proper wires...

abraxalito · 22nd January 2011, 07:30 AM

Quote:

Originally Posted by liquias

Due to skin effect I too always knew stranded is better ...

Wouldn't that only be an advantage if the strands were insulated from one another?

Quote:

Also I have seen allot of very professorial speaker cables which are stranded and I have never seen any solid conductor speaker cable.

I use Cat6 - that's solid core. I'm not the only one. Stranded speaker cables are popular because they're more flexible. Multiple thinner solid cores in parallel helps fix this drawback.

Quote:

How come skin effect is negligible ?

It pretty well is at audio frequencies unless your cable is a fairly thick one. Even then, inductance would probably be more of a concern than skin effect. It certainly is in speaker cables.

Quote:

And what does skin effect has to do with a wire's length ?

I can't think - its only related to the diameter and the magnetic permeability of the conductor I thought. Perhaps pacificblue made a mistake?

Andy5112405 · 22nd January 2011, 07:34 AM

As the LM3886 is a far stretch away from Hi-Fi in the ultimate sense, it doesn't make much difference and stranded is more manageable.

AndrewT · 22nd January 2011, 10:23 AM

Hi,
the skin effect is dependent on the apparent increase in resistance of a conductor when higher frequencies are passed through the conductor.

the resistance of any wire is proportional to it's length, it's conductivity and inversely proportional to it's cross sectional area.

LENGTH must be taken into account.

Would someone care to calculate the skin effect on a 0.6mm diam copper wire feeding 1Apk along 100mm of conductor to an 8r0 load, at 10Hz, 100Hz, 1kHz, 20kHz and 100kHz?

The answers will be instructive to all.

22nd January 2011, 06:41 AM	#15
pacificblue diyAudio Member Join Date: May 2008	Negligible. Especially for a length of 20 cm. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

22nd January 2011, 07:01 AM	#16
liquias diyAudio Member Join Date: Jul 2004 Location: israel haifa	How come ? Please consider this link: American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies Due to skin effect I too always knew stranded is better ... Also I have seen allot of very professorial speaker cables which are stranded and I have never seen any solid conductor speaker cable. How come skin effect is negligible ? And what does skin effect has to do with a wire's length ?

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22nd January 2011, 05:42 AM	#14
tangmonster diyAudio Member Join Date: Jul 2007 Location: Cape Town	How big is skin effect at audio frequencies?

22nd January 2011, 07:16 AM	#17
Urgon diyAudio Member Join Date: Oct 2010	AVE... 1.5mm stranded wire will be enough... At audio frequencies skin effect can be ignored - in case of stranded wire each strand will conduct the current with it's whole diameter... You will hear the difference because the original wire you used was too thin and had considerable resistance and voltage drop across it's length. Next time consider the maximum current flowing through the cable and select proper wires...

22nd January 2011, 07:34 AM	#19
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	As the LM3886 is a far stretch away from Hi-Fi in the ultimate sense, it doesn't make much difference and stranded is more manageable.

22nd January 2011, 10:23 AM	#20
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the skin effect is dependent on the apparent increase in resistance of a conductor when higher frequencies are passed through the conductor. the resistance of any wire is proportional to it's length, it's conductivity and inversely proportional to it's cross sectional area. LENGTH must be taken into account. Would someone care to calculate the skin effect on a 0.6mm diam copper wire feeding 1Apk along 100mm of conductor to an 8r0 load, at 10Hz, 100Hz, 1kHz, 20kHz and 100kHz? The answers will be instructive to all.