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Old 31st March 2012, 05:21 PM   #3251
Pano is offline Pano  United States
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I used to have that problem with a long SPDIF cable (about 8 meters). It turned out to be a grounding problem. Ceiling lights and sometime even the air conditioner at the other end of the house would cause the problem when turned on or off. Once I had installed a better ground in the listening room, the problem went away.

You may want to look at grounding problems in your house electrical system.
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Old 5th April 2012, 09:18 AM   #3252
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Default flat-cable pin out spreadsheet

FYI

I made a spreadsheet containing the information on the flat-cable pin out based on the Behringer schematics. Only did the in and output cables!

For me it is useful, hope it is for others too.

May contain errors!! So please check for yourself.
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Old 5th April 2012, 10:39 AM   #3253
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Default Good info

Peter,
Good info, thank you.

Pano,
I had a grounding issue (hum, rather than dropouts) with long SPDIF/AES cable from SRC2496 to DCX.

Solved with tiny pulse transformer pulled from an old network card.

It even fits in the XLR plug

Hope this is useful to someone,
AP
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Old 5th April 2012, 11:08 AM   #3254
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Auto,
please explain with a schematic.
What is a pulse transformer?
Where else might one find them?
How does one recognise them?
What type of problems are they capable of solving/attenuating?
etc?
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Old 5th April 2012, 11:34 AM   #3255
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Andrew, these are the ones I use:
http://www.murata-ps.com/data/magnetics/kmp_da100.pdf

As with any other sort of input or output transformer, they provide galvanic isolation and bandwidth limiting, as well as being able to interface single ended and balanced circuits. Other types are useful for impedance and level transformation (e.g., AES/EBU to spdif).
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Old 5th April 2012, 11:53 AM   #3256
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Thumbs up Twisted Pear Toslink input installed

The twisted pear solutions works very well and is easy to build / instal.

Stole the +5V / GND directly from the output pins of the power supply.

I have not changed the resistor value at the input transformer. What advantage would this bring?
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Old 5th April 2012, 12:25 PM   #3257
AndrewT is offline AndrewT  Scotland
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The Murata and maybe the cs2501 appear to be 6pin devices.

Are the middle pins for a centre tap?

Do all pulse transformers come in 6pin format?
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Old 5th April 2012, 07:18 PM   #3258
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Quote:
Originally Posted by AndrewT View Post
The Murata and maybe the cs2501 appear to be 6pin devices.

Are the middle pins for a centre tap?

Do all pulse transformers come in 6pin format?
Hi Andrew,

Sy's link shows 4/6 pin, but not CT.

IIRC I never found a cs2501 datasheet, only for similar parts (some CT).

It seemed logical that NICs would use them (imagine office building ground loopiness otherwise); and if OK for 10mb/s ethernet, SPDIF should be a cinch. So I went rummaging, and found something that measured equal R from centre to side pins, open circuit from one edge to the other, and looked rather like the 4-pin one in my tube Dac ("pulse transformer" on Sheldon Stokes' BOM).

In it went. I was delighted when it worked!

Best,
AP

PS, My first and only use of 'looks like' for component selection, honest
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Old 5th April 2012, 07:47 PM   #3259
SY is offline SY  United States
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Not much use for a CT in this application.
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Old 6th April 2012, 04:19 AM   #3260
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Cool! I also used a pulse transformer and it worked well (IIRC) until I tripped over the cable and pulled the poor transformer apart!

Sending the SPDIF signal over a balanced line is a good idea, if much distance in involved.
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