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Old 3rd November 2005, 10:21 PM   #1
Katapum is offline Katapum  Europe
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Default S/PDIF Digital output

Hi all,

I have an Arcam Alpha 5 working only as a transport. I built a new digital output with a new Pulse transformer (see att. picture).

Any comments or suggestions are very welcome.

Katapum
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Old 3rd November 2005, 11:13 PM   #2
Jocko Homo is offline Jocko Homo  United States
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Comment: I don't like it.

Jocko
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Old 4th November 2005, 04:57 AM   #3
dddac is offline dddac  Germany
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S/PDIF Digital output
Quote:
Originally posted by Jocko Homo
Comment: I don't like it.

Jocko
would be nice to hear why and what you suggest ?

regards
doede
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Old 4th November 2005, 09:37 AM   #4
Calimero is offline Calimero
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Default A good starting point is:

http://www.diyhifi.org/forums/viewto...r=asc&start=90

Henk
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Old 4th November 2005, 01:46 PM   #5
dddac is offline dddac  Germany
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S/PDIF Digital output
Thanks! Worthwhile reading, answered my questions ..

regards
doede
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Old 4th November 2005, 04:24 PM   #6
Jocko Homo is offline Jocko Homo  United States
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I have already done that, many times, but let's start here:

What is the ouptput impedance?


Jocko
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Old 4th November 2005, 08:55 PM   #7
carlosfm is offline carlosfm  Portugal
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Quote:
Originally posted by Jocko Homo
I have already done that, many times, but let's start here:

What is the ouptput impedance?
Jocko
Ops... that signal is not attenuated to SPDIF (0.5V p-p) level...
Impedance? Not 75R for sure.
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Old 4th November 2005, 09:40 PM   #8
hifi is offline hifi  Sweden
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SAA7220P/B:s output impedance is not 0ohm
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Old 5th November 2005, 12:22 AM   #9
Jocko Homo is offline Jocko Homo  United States
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At least 2 of you guys have been paying attention.............

OK, assuming that he fixes those problems, what transformer is it?? All pulse transformers are not created equally. Most are useless for SPDIF.

If you don't believe me, try the one that comes stock in Philips CPDs. Designed to minimise EMI, not performance.

Jocko
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Old 5th November 2005, 06:55 AM   #10
Katapum is offline Katapum  Europe
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Hi,


Jocko Homo:

Pulse transformer is a PE-65612.

The original schematic will be better?


Katatapum
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