1:1 Center-taped transformer - Electronic Circuits Projects Diagrams Free

richacm · 27th June 2008, 12:46 AM

Hi,

I have been using the datasheet for the ENC28J60 (http://shop.tuxgraphics.org/snippets....pdf?id=1fb4a0) to connect to my network. In it it says to use a 1:1 center-taped pulse transformer rated for Ethernet operation. I have been trying to find a part that meets these requirements but haven't been able to.

Does anyone know a part number that would work?

Thanks,

Craig

dknguyen · 27th June 2008, 12:53 AM

Will these do?

PWB Wideband RF Transformers

You can order small quantities from their website.

Have you done a Digikey search yet?

Mikebits · 27th June 2008, 01:02 AM

Here are a few more PHY transformers:
Belfuse: S558-5999-U7
Halo: TG110-SO55N2
Tyco/Transpower Technologies: Part # HB626-1, HB726, 1605000-1
Pulse Engineering: Part # H1102, H1117, H1012, J1035, J0011D21B
Midcom: 000-7160-30R
Sorry I did not have links, you should be able to google the pn#

richacm · 27th June 2008, 01:54 AM

Thanks, I especially like the J0011D21B - have tried to get a sample from pulse engineering. They don't seem to have a shopping cart facility and I couldn't find any other suppliers selling it. Does anyone know where I can buy one of these?

Thanks,

Craig

Mikebits · 27th June 2008, 02:17 AM

Digi-Key has it.
Digi-Key - J0011D21B-ND (Pulse - J0011D21B)

richacm · 27th June 2008, 02:25 AM

Oh yes so they do. I have to order 125 of them though!

Does anyone want to buy the other 124 off of me?

Mikebits · 27th June 2008, 02:40 AM

That 125 unit quote is what is required for price break, I am sure you can still make a small order at higher cost. Call them or try their online chat thingy.

mvs sarma · 27th June 2008, 04:49 AM

Quote:

Originally Posted by richacm

Thanks, I especially like the J0011D21B - have tried to get a sample from pulse engineering. They don't seem to have a shopping cart facility and I couldn't find any other suppliers selling it. Does anyone know where I can buy one of these?

Thanks,

Craig

These appear to be like communication transformers used for ISDN modems. In case you come across any salvaged ISDN Modem, probably you could retrieve them.

Mikebits · 27th June 2008, 05:02 AM

For that matter, just salvage from an old ethernet card. That x-former is standard on all of em.

mvs sarma · 27th June 2008, 05:22 AM

You are right Mike, and the component can be physically positioned and hand-wired if pin compatibility is an issue.

audioguru · 28th June 2008, 12:19 AM

If you spell it correctly then you might get what you want at a low price.
A center taped transformer is completely different from a center-tapped transformer.

mvs sarma · 28th June 2008, 03:39 AM

Quote:

Originally Posted by audioguru

If you spell it correctly then you might get what you want at a low price.
A center taped transformer is completely different from a center-tapped transformer.

I request for little more clarity on the said spelling. I do understand that a transformer of this type cant be described in words and only thing is proper schematic with data and / or code number, if known.

audioguru · 28th June 2008, 05:05 AM

You must use the correct spelling or give up doing technical things. Do gardining instead.

A center-tapped transformer is with a tap in the center of its winding. A center-taped transformer has a piece of tape in its winding that does nothing.

Mikebits · 28th June 2008, 05:45 AM

Quote:

Originally Posted by audioguru

You must use the correct spelling or give up doing technical things. Do gardining instead.

There is only one i in gardening

mvs sarma · 28th June 2008, 03:16 PM

Quote:

Originally Posted by Mikebits

There is only one i in gardening

Oh Mike, accidental spelling mistakes do happen. We need not bother that seriously Sir. let us take his intention that youth should have good command over the language, as they have a lot to do in future.

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27th June 2008, 12:46 AM	(permalink)
richacm	1:1 Center-taped transformer Hi, I have been using the datasheet for the ENC28J60 (http://shop.tuxgraphics.org/snippets....pdf?id=1fb4a0) to connect to my network. In it it says to use a 1:1 center-taped pulse transformer rated for Ethernet operation. I have been trying to find a part that meets these requirements but haven't been able to. Does anyone know a part number that would work? Thanks, Craig

27th June 2008, 12:53 AM	(permalink)
dknguyen	Will these do? PWB Wideband RF Transformers You can order small quantities from their website. Have you done a Digikey search yet? __________________ NO, that picture isn't me so don't bother asking if we can be friends. Last edited by dknguyen; 27th June 2008 at 12:54 AM.

27th June 2008, 01:02 AM	(permalink)
Mikebits	Here are a few more PHY transformers: Belfuse: S558-5999-U7 Halo: TG110-SO55N2 Tyco/Transpower Technologies: Part # HB626-1, HB726, 1605000-1 Pulse Engineering: Part # H1102, H1117, H1012, J1035, J0011D21B Midcom: 000-7160-30R Sorry I did not have links, you should be able to google the pn# Last edited by Mikebits; 27th June 2008 at 01:03 AM.

27th June 2008, 01:54 AM	(permalink)
richacm	Thanks, I especially like the J0011D21B - have tried to get a sample from pulse engineering. They don't seem to have a shopping cart facility and I couldn't find any other suppliers selling it. Does anyone know where I can buy one of these? Thanks, Craig

27th June 2008, 02:17 AM	(permalink)
Mikebits	Digi-Key has it. Digi-Key - J0011D21B-ND (Pulse - J0011D21B)

27th June 2008, 02:25 AM	(permalink)
richacm	Oh yes so they do. I have to order 125 of them though! Does anyone want to buy the other 124 off of me?

27th June 2008, 02:40 AM	(permalink)
Mikebits	That 125 unit quote is what is required for price break, I am sure you can still make a small order at higher cost. Call them or try their online chat thingy. Last edited by Mikebits; 27th June 2008 at 02:40 AM.

27th June 2008, 05:02 AM	(permalink)
Mikebits	For that matter, just salvage from an old ethernet card. That x-former is standard on all of em.

27th June 2008, 05:22 AM	(permalink)
mvs sarma	You are right Mike, and the component can be physically positioned and hand-wired if pin compatibility is an issue. __________________ Regards, Sarma.

28th June 2008, 12:19 AM	(permalink)
audioguru	If you spell it correctly then you might get what you want at a low price. A center taped transformer is completely different from a center-tapped transformer. __________________ Uncle $crooge

28th June 2008, 05:05 AM	(permalink)
audioguru	You must use the correct spelling or give up doing technical things. Do gardining instead. A center-tapped transformer is with a tap in the center of its winding. A center-taped transformer has a piece of tape in its winding that does nothing. __________________ Uncle $crooge