Best 12uH output inductor for Tripath from Mouser? - diyAudio
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Old 19th September 2009, 01:49 PM   #1
sendler is offline sendler  United States
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Default Best 12uH output inductor for Tripath from Mouser?

Mouser caries two different J.W. Miller vertical toroid inductors from the 2100 series. Different core material? There is also a third, low loss "LL" core which Mouser doesn't seem to list that I could find somewhere else. Which style would have the best performance in the output of a Tripath 2050 for mods of the Sure 2x100 amp module. The low loss core shows the biggest change in inductance between low load and maximum current. Almost 50%.
http://www.bourns.com/data/global/pdfs/2100_series.pdf
http://www.bourns.com/data/global/pd...0ht_series.pdf
http://www.bourns.com/data/global/pd...0ll_series.pdf
Do the Carbonal cores that people are using to wind their own toroids exhibit a similar amount of inductance change? Is this drop in inductance only decreasing rapidly, all toward the end of the maximum current rating that we never listen to? Or, is it also an indication of drooping inductance all through the usefull range of 0-2 amps?
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Old 19th September 2009, 02:09 PM   #2
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I have some inductors you can have if you want.

You can choose from either some used ~11uH toroids removed from a Tripath amp, or some new C&D Technologies 10uH 13A bobbin inductors (part #1410213).

If you get back to me soon, I'm on my way to the post office anyway.
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Old 19th September 2009, 07:34 PM   #3
sendler is offline sendler  United States
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Default Off the shelf

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Originally Posted by theAnonymous1 View Post
I have some inductors you can have if you want.

You can choose from either some used ~11uH toroids removed from a Tripath amp, or some new C&D Technologies 10uH 13A bobbin inductors (part #1410213).

If you get back to me soon, I'm on my way to the post office anyway.
Thanks, but I am trying to come up with something off the shelf that we can buy on a continuing basis.
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Old 19th September 2009, 11:32 PM   #4
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Quote:
Originally Posted by sendler View Post
Thanks, but I am trying to come up with something off the shelf that we can buy on a continuing basis.
No problem.

I'm no expert, but I don't think the toroids you linked to above would be suitable. I think these are meant for power supply applications where the constant sloping saturation curve doesn't matter as much?

If winding your own is a possibility, I suggest trying to get ahold of some Ferroxcube gapped toroid cores.

http://www.ferroxcube.com/appl/info/...0amplifier.pdf

Last edited by theAnonymous1; 19th September 2009 at 11:42 PM.
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Old 20th September 2009, 05:54 AM   #5
Baldin is offline Baldin  Denmark
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Hi Anonymous1

Haden't seen those. Nice cores

Anyone know where to bye these on the net?? ... maybe in europe??

/Baldin
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Old 20th September 2009, 09:50 AM   #6
ElFishi is offline ElFishi  Europe
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Arjen sell some nice inductors at a very reasonable price
http://cgi.ebay.com/Choke-coil-for-c...mZ260469362956

and there are people who have experiences with those
http://www.diyaudio.com/forums/showp...&postcount=289
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Old 22nd September 2009, 03:15 PM   #7
sendler is offline sendler  United States
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Default No ready made output toroids available?

Is it just me or doesn't it seem weird that there is only one guy in the whole world, hand winding one value of toroid, that can be recommended for the output of a Tripath? Hours of searching the forums and I have come up with no recommended part numbers. I know many people are finding it fun to wind their own coils but there must be a supplier that has a range of ready made coils that were designed for these amps.
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Old 23rd September 2009, 03:00 AM   #8
Bosk is offline Bosk  Australia
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I've been considering replacing the inductors in my Arjen amp (same as the ones pictured above) with air core inductors, which I've read deliver an 'airier' presentation.

Just wondering if anyone would happen to know of a source for 10uH air core inductors, or a guide that will explain how I can wind my own?

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Old 23rd September 2009, 09:15 AM   #9
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I was going to say that as long as no one suggests using air core coils, you'd probably be fine. Though specialized fully shielded high frequency cores would be preferable.

Air core coils in high frequency circuits is a big mistake though, and will most probably have the police knocking down your door, and thrown you in jail within hours of turning it on.

And even if you can somehow manage to fully shield those (which is pretty near impossible) air coils are good in low frequency circuits, especially speaker crossovers where core saturation will vary a lot and take time to build up, whereas in high frequency circuits core saturation is something that is near constant and near instant, and therefore calculated into the value.

In short, no sane person should even consider using air core coils for this purpose. Just don't!
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Old 23rd September 2009, 08:13 PM   #10
sendler is offline sendler  United States
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Default DIY teflon over foil air cores

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you'd probably be fine.
. Not exactly the glowing recommendation that I was hoping for. I guess every manufacturer of Tripath amps winds there own inductors as there seems to be no ready made coil for this application. I can't wait to try my new self made teflon over foil air cores. The parts should arrive from McMaster-Carr tomorrow so I can wind them up as soon as I get back from running with my scissors.
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