Where to buy ferrite cores?

cjk2 · 21st December 2009, 06:36 AM

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

TechGuy · 22nd December 2009, 10:05 PM

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.

carvinguy · 23rd December 2009, 05:40 PM

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.

event horizon · 23rd December 2009, 05:47 PM

ETD39

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

sphinx · 25th December 2009, 12:24 PM

I've purchased small quantities from Adams Magnetic

Conrad Hoffman · 25th December 2009, 02:24 PM

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.

Sch3mat1c · 27th December 2009, 07:03 PM

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.

Tim

microsim444 · 28th December 2009, 04:41 PM

rswww.com

poobah · 28th December 2009, 05:15 PM

Here...

MTL Distribution

These guys have cores, bobbins, etc... they will also gap cores to your specs. Nice people... been working with them for years.

Geek · 29th December 2009, 02:27 AM

Quote:

Originally Posted by Sch3mat1c

There seems to be a shortage of small order companies...

Amidon is the only one offhand.

x2 Amidon.

Great service, prompt replies, no problems

Cheers!

21st December 2009, 06:36 AM	#1
cjk2 diyAudio Member Join Date: Nov 2006	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

23rd December 2009, 05:47 PM	#4
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	ETD39 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 __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

25th December 2009, 02:24 PM	#6
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	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. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

27th December 2009, 07:03 PM	#7
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	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. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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22nd December 2009, 10:05 PM	#2
TechGuy diyAudio Member Join Date: Apr 2006 Location: Connecticut	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.

23rd December 2009, 05:40 PM	#3
carvinguy diyAudio Member Join Date: Jan 2005 Location: So. California, USA	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.

25th December 2009, 12:24 PM	#5
sphinx diyAudio Member Join Date: Nov 2004 Location: Toronto, Ontario	I've purchased small quantities from Adams Magnetic

28th December 2009, 04:41 PM	#8
microsim444 Account Disabled Join Date: Oct 2008	rswww.com

28th December 2009, 05:15 PM	#9
poobah diyAudio Member Join Date: Nov 2005	Here... 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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