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Old 21st December 2009, 06:36 AM   #1
cjk2 is offline cjk2  United States
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Default Where to buy ferrite cores?

Any ideas on where to buy a few ETD 39mm ferrite cores and bobbins? Type 77 or 78 or equivalent material would be best. I have had no real luck finding a place in the US that sells small quantities.

Farnel has some avaible as "export only" and I believe there is a $25 s/h fee possible as well. CWS seems to have only the E cores for sale, not the type with the round bobbins (ETD style like I need). I normally go to amidon for ferrite but they don't sell ETD cores sadly.

Does every one just reuse cores out of other power supplies?

Where do you get the yellow tape? Is something like this about right? JVCC EGPF-01 Kapton Polyimide Film Tape (1 mil) at FindTape.com
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Old 22nd December 2009, 10:05 PM   #2
TechGuy is offline TechGuy  United States
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Ferrites & Bobbins (ETD39 -Round Core):
Ferrite: E Cores

The Polymide tape will work great. It will outperform the standard vinyl transformer tape because it has a much greater temperature and dielectric breakdown.
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Old 23rd December 2009, 05:40 PM   #3
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I've purchased small quantities from AllStar Magnetics. You may have to search their site a bit or email them, but I would think they have your core/bobbin.
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Old 23rd December 2009, 05:47 PM   #4
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I'm not sure if this matches the ferrite grade you are after but the specs look rather good.

Hope this helps Look at the other stuff the guy has to
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Old 25th December 2009, 12:24 PM   #5
sphinx is offline sphinx  Canada
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I've purchased small quantities from Adams Magnetic
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Old 25th December 2009, 02:24 PM   #6
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Eastern Components was purchased by Elna and I don't know their current policies, but that's where I've always been able to get small quantities. Sometimes they can be talked out of a sample for off the shelf items. For toroids and a few other shapes, Amidon is the place to go. They've always catered to hams and will process small quantity orders.
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Old 27th December 2009, 07:03 PM   #7
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There seems to be a shortage of small order companies...

Amidon is the only one offhand.

Newark stocks a variety of ferrites and such.

You might get lucky at the surplus places... Electronic Goldmine and All Electronics come to mind. All Electronics recently went out of stock of some rather large toroids, which go for about $30 from other suppliers (and it looks like Nebraska Surplus follows the same pricing). I got a bunch of 'em for $3.50 each.

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Old 28th December 2009, 04:41 PM   #8
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Old 28th December 2009, 05:15 PM   #9
poobah is offline poobah  United States
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MTL Distribution

These guys have cores, bobbins, etc... they will also gap cores to your specs. Nice people... been working with them for years.
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Old 29th December 2009, 02:27 AM   #10
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Originally Posted by Sch3mat1c View Post
There seems to be a shortage of small order companies...

Amidon is the only one offhand.
x2 Amidon.

Great service, prompt replies, no problems

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