Toroid Inductor Service

Einric · 8th October 2011, 05:28 AM

I am thinking about starting to wind toriodial inductors for a small time side business.
I figure I can wind from .2mh to 20mh +- 3% on FT240 size toroids in 12 to 18 awg.
Would anybody be interested in purchasing any?
If not I will just build for myself.
Toroids seem to be great for their low DCR and an FT240 toroid should be very difficult to saturate.
Let me know.

Thanks

Ed LaFontaine · 8th October 2011, 02:12 PM

I would suggest posting over @ Parts Express "Tech Talk" to increase your exposure.

Free Classifieds - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com

Can you provide a description of "FT240" and some representative pricing?

AVWERK · 8th October 2011, 02:38 PM

How about those R cores instead? Toroids are plentiful here in the states.
I don,t know of any R core manfactured here. Overseas shipping is ridculous on these, every one of them.
Start there first and your efforts will be rewarded for these low noise trannies.
I don,t know where the "R"designation got started. They resemble an D or oval O in looks actually.

Regards
David

Einric · 8th October 2011, 02:50 PM

Quote:

Can you provide a description of "FT240" and some representative pricing?

Ed,

In singles quantity I would expect a rough range of $30-$55 depending on the gauge and values needed.
I'm currently looking into an L meter that would give me closer to +-1% tolerances.

I'm still in the planning stages and will decide how crazy to get depending on the response here.
Everybody at DIY Audio has been very helpful and I'd like to give back.

Lazybutt · 8th October 2011, 03:59 PM

Quote:

Originally Posted by AVWERK

I don,t know where the "R"designation got started. They resemble an D or oval O in looks actually

I remember reading it's coming from the fact they have a "Rectangular" Core

ByronInLawrence · 8th October 2011, 04:13 PM

I would buy a pair of 2.2uH (that's micro Henry) inductors made of 14awg or thicker wire with radial leads ~22mm apart right now, if you can make them.

Einric · 8th October 2011, 07:17 PM

Quote:

Originally Posted by ByronInLawrence

I would buy a pair of 2.2uH (that's micro Henry) inductors made of 14awg or thicker wire with radial leads ~22mm apart right now, if you can make them.

PM Sent

woody · 9th October 2011, 12:52 AM

When you listed .2 to 20 mh range I am assuming you are intended these for
audio use or power supply filtering. Well if you look at the speck sheet you
will see that the cores are intended to be used in the mhz range and won't
work for low frequencies the core would saturate at verry verry low power.

Einric · 9th October 2011, 01:50 AM

Woody,

I did notice that and I am currently looking for a good source of ferrous powder torroids for proper application.
The FT240 is a reference of size at this point.

Thanks

8th October 2011, 05:28 AM	#1
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	Toroid Inductor Service I am thinking about starting to wind toriodial inductors for a small time side business. I figure I can wind from .2mh to 20mh +- 3% on FT240 size toroids in 12 to 18 awg. Would anybody be interested in purchasing any? If not I will just build for myself. Toroids seem to be great for their low DCR and an FT240 toroid should be very difficult to saturate. Let me know. Thanks

8th October 2011, 02:12 PM	#2
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	I would suggest posting over @ Parts Express "Tech Talk" to increase your exposure. Free Classifieds - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com Can you provide a description of "FT240" and some representative pricing? __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

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8th October 2011, 02:38 PM	#3
AVWERK diyAudio Member Join Date: Jan 2004 Location: OC,Calif.	How about those R cores instead? Toroids are plentiful here in the states. I don,t know of any R core manfactured here. Overseas shipping is ridculous on these, every one of them. Start there first and your efforts will be rewarded for these low noise trannies. I don,t know where the "R"designation got started. They resemble an D or oval O in looks actually. Regards David

8th October 2011, 04:13 PM	#6
ByronInLawrence diyAudio Member Join Date: Nov 2010 Location: Lawrence, a nice little college town in Kansas	I would buy a pair of 2.2uH (that's micro Henry) inductors made of 14awg or thicker wire with radial leads ~22mm apart right now, if you can make them.

9th October 2011, 12:52 AM	#8
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	When you listed .2 to 20 mh range I am assuming you are intended these for audio use or power supply filtering. Well if you look at the speck sheet you will see that the cores are intended to be used in the mhz range and won't work for low frequencies the core would saturate at verry verry low power.

9th October 2011, 01:50 AM	#9
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	Woody, I did notice that and I am currently looking for a good source of ferrous powder torroids for proper application. The FT240 is a reference of size at this point. Thanks

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