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North American Ferrite core supplier for prototypes

P

Pooh Bear

Jan 1, 1970
0
Spehro said:
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

Tried Epcos ?

Uk support for samples seems to be good.

Damn fine ferrite magnetic design program too ! Invaluable I'd say.

Graham
 
S

Spehro Pefhany

Jan 1, 1970
0
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

Joerg?


Best regards,
Spehro Pefhany
 
S

Spehro Pefhany

Jan 1, 1970
0
Tried Epcos ?

Uk support for samples seems to be good.

Damn fine ferrite magnetic design program too ! Invaluable I'd say.

Graham

Too bad ElectroValue is in Rightpondia.


Best regards,
Spehro Pefhany
 
P

Pooh Bear

Jan 1, 1970
0
Spehro said:
Too bad ElectroValue is in Rightpondia.

Surely you have some friendly distributors over there ?

After Epcos I'd suggest Ferroxcube and then maybe TDK. Again - you'll have to
find distributors.

Are you looking for a specific core size ( general area ) or form style ?

Graham
 
C

Chris Carlen

Jan 1, 1970
0
Spehro said:
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

Joerg?


Best regards,
Spehro Pefhany


AllStar Magnetics
 
S

Spehro Pefhany

Jan 1, 1970
0
Surely you have some friendly distributors over there ?

I think they're more than friendly to transformer winders, not to
engineers.
After Epcos I'd suggest Ferroxcube and then maybe TDK. Again - you'll have to
find distributors.

Are you looking for a specific core size ( general area ) or form style ?

Graham

Small. I have some RM6 44 that will probably do but they're a touch
taller than I'd like. Here's a photo of a cute little gapped EE core
transformer that does about what I want to do:

http://www.speff.com/flyback_converter.jpg

Power is only about 25mW at 50-100kHz (discontinuous mode flyback).
Must be a lot of leakage inductance with that split bobbin. It's taped
and all glopped over with conformal coating, so the core is smaller
than it looks.


Best regards,
Spehro Pefhany
 
T

Tim Wescott

Jan 1, 1970
0
Spehro said:
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

Joerg?


Best regards,
Spehro Pefhany

Amidon, http://www.amidoncorp.com/aai_productselection.htm, sells
Fair-Rite ferrite and Micrometals iron powder stuff. IIRC it's pretty
easy to look at the Fair-Rite website and tell which piece is which
Amidon part.
 
S

Spehro Pefhany

Jan 1, 1970
0
Amidon, http://www.amidoncorp.com/aai_productselection.htm, sells
Fair-Rite ferrite and Micrometals iron powder stuff. IIRC it's pretty
easy to look at the Fair-Rite website and tell which piece is which
Amidon part.

Ah, Fair-Rite has a search engine that shows distributor stock for
four distributors including Amidon and Deltron in the UK (but no
prices). Okay, better than a poke in the eye with a sharp stick.

I don't know what kind of knucklehead programmer designed the "PO"
form, though. Who would use this option?

"To send the same Purchase Order to additional suppliers, follow these
steps"

Who would send a PO to even one supplier without having a price quote,
for that matter?


Best regards,
Spehro Pefhany
 
J

Jonathan Kirwan

Jan 1, 1970
0
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

I've just been struggling with a related question, myself. I bought
out a whole rack of various toroids and cylinders (ferrite and
powdered iron of differing permeability) to play with. I'm interested
as a hobbyist and want to file away (dremel) bits of them to create
gaps of different types and to test what I've been able to learn from
the Unitrode magnetics books and class.

I'd like a mail-order supplier from which I can order any particular
basic shape or paired shapes in any particular desired type in small,
hobbyist quantities at reasonable prices. Permalloy tape-wound for
low freq, amorphous metal alloys for higher freqs, etc. Composite
powdered iron, permalloy, Kool Mu, and ferrite in toroids, various
cylinders, etc. Just toys to play with.

But I'd like to know what the material is and its expected properties,
when I buy it. Not because I need to depend on it, as I'd like to see
about figuring these things out for myself. But because I'd like to
be able to compare my results with the "known" value to see how I'm
doing when I do figure something out and would like to know if I got
anywhere close to right. Some of the places that sell these things
"on the cheap" provide NO INFO, at all.

Jon
 
R

Robert Baer

Jan 1, 1970
0
Spehro said:
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

Joerg?


Best regards,
Spehro Pefhany
Try http://www.allstarmagnetics.com/ and they will sample small
quantities for the cost of shipping.
If gap grinding is needed, then there is a set-up charge for that.
There are probably other good places...
 
R

Robert Baer

Jan 1, 1970
0
Spehro said:
I think they're more than friendly to transformer winders, not to
engineers.




Small. I have some RM6 44 that will probably do but they're a touch
taller than I'd like. Here's a photo of a cute little gapped EE core
transformer that does about what I want to do:

http://www.speff.com/flyback_converter.jpg

Power is only about 25mW at 50-100kHz (discontinuous mode flyback).
Must be a lot of leakage inductance with that split bobbin. It's taped
and all glopped over with conformal coating, so the core is smaller
than it looks.


Best regards,
Spehro Pefhany
Ferroxcube P14/8 or P14/8/I are a little larger in one dimension and
smaller in the other.
Their P11/7 is certainly compariable in size.
Their RM6R is about 17.9 mm wide by 12.4 mm high.
How about their E12/6/3 with the I19/6/5? crappy match, but that
keeps one dimension down...
 
T

Tony Williams

Jan 1, 1970
0
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

http://www.farnell.com in UK to see data/stocks but
they own Newark Electronics and apparently direct
Farnell part numbers can be ordered via them.
 
S

Spehro Pefhany

Jan 1, 1970
0
http://www.farnell.com in UK to see data/stocks but
they own Newark Electronics and apparently direct
Farnell part numbers can be ordered via them.

Thanks, Tony:-

Hmm.. Newark themselves show some AVX (Thompson) E-cores at low
prices, but 2-month lead times, huge minimum orders (like hundreds up
to >10,000 pieces) and no stock. 8-(

They're better on Ferroxcube- 17 days lead time and minimum oder 1
piece (and no stock shown, but probably they're drawing on Farnell, as
you suggest).

Digikey could easily take up the latter supplier, they already deal
with Ferroxcube's masters in Taipei (the old resistor company Yageo).


Best regards,
Spehro Pefhany
 
J

Joerg

Jan 1, 1970
0
Hello Spehro,
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

I'll second Tim's suggestion, Amidon. They have been good to me for
decades and I even bought from them while in Europe. Haven't bought
there lately but that is because I had stocked up big time on all the
cores I might ever need in the lab.

If you can't find a core in their catalog call them. Often they can
source it for you. BTW, many of their publications are good, too.

Regards, Joerg
 
J

Joerg

Jan 1, 1970
0
Hello Spehro,

Another one, especially for power ferrites:

http://www.kaschke.de/

Contact Olaf Niemann (details on Int'l Sales page) for tech questions.
These guys are very knowledgeable and speak English well.

Regards, Joerg
 
C

Chris Carlen

Jan 1, 1970
0
Spehro said:
I think they're more than friendly to transformer winders, not to
engineers.


Small. I have some RM6 44 that will probably do but they're a touch
taller than I'd like. Here's a photo of a cute little gapped EE core
transformer that does about what I want to do:

http://www.speff.com/flyback_converter.jpg

Power is only about 25mW at 50-100kHz (discontinuous mode flyback).
Must be a lot of leakage inductance with that split bobbin. It's taped
and all glopped over with conformal coating, so the core is smaller
than it looks.


This is my flyback based on Ferroxcube's E13/7/4-3C90 (or maybe 3C94 of
3F3, I forget). It can do about 6W!


http://web.newsguy.com/crcarl/images/060205-0029-v1.30s-900x600-7.jpg

I think it came from AllStar, but there was another Ferroxcube
ditributor that I dealt with too that sold reasonably small quantities
of stuff.


Good day!
 
S

Spehro Pefhany

Jan 1, 1970
0
Hello Chris,


Ah, Nixie tubes. The good old days. This must have been a while back. I
was surprised that there is an Atmel chip on the board

I think it's one of those retro things. The board is clearly
contemporary, though a deliberate choice has been made to use
through-hole parts.


Best regards,
Spehro Pefhany
 
B

Boris Mohar

Jan 1, 1970
0
Any suggestions for a North American supplier with a good online
presence? Tiny to large E/RM/Pot core etc.

Most of the distributors and agents seem to have high minimum orders,
no online stock checking, no online ordering etc. etc. just like in
the 1970s. There's one within 15 minutes of my office, plenty of
stock, but they want C$100 per *line item* minimum order (clamps,
bobbins and cores are 3 line items...).

The only thing that seems to have changed with the internet is all the
data and application notes are now online. I don't want to deal with
surplus houses, the product needs to be known brand name stuff that
can be had in production quantities.

http://www.neosidcanada.com/company.htm

One time they cut and ground me few pieces for a custom job. Very
approachable. None of this " And how many million will you be planning to
purchase from us in the future"
 
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