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Old 28th January 2015, 11:11 PM   #1
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Default multi strand inductor coils... opinions please

So I've just bought some intertechnik inductors, 1.8mh .5dcr air cores, these were cheap second hand so I figured they were worth a punt.

I'm a but thrown off as it appears to be a multi-strand winding (7strands, not individually insulated).

Any advice info or opinions?

Never encountered any kind of multi strand inductor before so any and all info/advice is appreciated
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Old 29th January 2015, 12:03 AM   #2
Dissi is offline Dissi  Switzerland
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Don't worry. According to a review in HOBBYHiFi 4/2000 they are better than single wire inductors, almost as good as foil inductors!

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Old 29th January 2015, 12:09 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

More solderable in my opinion versus solid core.

rgds, sreten.
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Old 29th January 2015, 12:24 AM   #4
infinia is online now infinia  United States
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according the link they are litz wire , (litz lowers conductor losses due to skin effect) not a game changer for speaker stuff. may appeal to part fetish types although copper foil looks cooler IMO.

an audio inductor is supposed to increase impedance to higher frequencies, so using litz wire is redundant. now for transformers and RF resonant tanks they are very useful.
any claims from intertechnik are purely sales puffery
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Last edited by infinia; 29th January 2015 at 12:38 AM.
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Old 29th January 2015, 12:34 AM   #5
jcx is online now jcx  United States
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really need individual insulation for best advantage re skin effect

"bunch wiring" is a poor man's Litz - larger fewer insulated conductors without special weave that Litz uses to make sure the conductors are well spatially averaged

in a bunch winding some strands may be more "inside" than others with no particular attention having been paid

but still an improvement over solid wire for Eddy current and Skin/Proximity losses
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Old 29th January 2015, 12:59 AM   #6
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Quote:
Originally Posted by infinia View Post
an audio inductor is supposed to increase impedance to higher frequencies, so using litz wire is redundant. now for transformers and RF resonant tanks they are very useful.
Increase impedance certainly, increase losses (which is what skin/proximity effect are) not necessarily. More losses means lower Q as the frequency goes up, it can be an issue for very low DCR multi-layer coils wound with thick wire.
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Old 29th January 2015, 08:43 AM   #7
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Needless.

Eddy currents/Proximity/Skin effect? In audio? Come on!
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Old 29th January 2015, 10:14 AM   #8
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Old 29th January 2015, 10:52 AM   #9
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What little education I have would suggest that all these effects are irrelevant in xo design.

I go by inductance and dcr primarily, hysteresis secondly, and at a third level am concerned with distortion anomalies.

I guess my question was why not just use a thicker wire, and I can only presume you'd manufacture with multi strand to save money. Plus, my intuition says thid is poor practice... so my real question is what potential distortion anomalies are in my blind spot here and can you point out.

At this point it seems like a good inductor but nothing special... I'll be trying it in a 2nd order xo shortly (acoustic and electric) along with the audyn plus caps... I'll measure them too and let you know what I think/find
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Old 29th January 2015, 11:06 AM   #10
afa is offline afa  Australia
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inductance = inductance
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