Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th December 2011, 04:18 AM   #81
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by abraxalito View Post
Yes I've followed Jocko's writings with immense interest. He seems to me to put undue emphasis on waveform fidelity and ignore common-mode noise.
I disagree. His emphasis is correct. Especially for the CS/AK Chips.

Quote:
Originally Posted by abraxalito View Post
So he disses (for example) the low interwinding capacitance designs of SC because such buy their low capacitance at the expense of higher leakage inductance.
Try measuring them...

Ciao T
  Reply With Quote
Old 5th December 2011, 05:11 AM   #82
Sin Bin
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 84
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by ThorstenL View Post
I disagree. His emphasis is correct. Especially for the CS/AK Chips.
I'm curious to learn why the emphasis on waveform fidelity over CM noise. Any anecdotes to share?

Quote:
Try measuring them...
They're not so easy to get hold of here so I'll pass on that. I prefer to roll my own solution and not (in general) to rely on a single source of boutique-style parts.
  Reply With Quote
Old 5th December 2011, 06:16 AM   #83
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by abraxalito View Post
I'm curious to learn why the emphasis on waveform fidelity over CM noise. Any anecdotes to share?
Look at the way the various receivers trigger...

Quote:
Originally Posted by abraxalito View Post
They're not so easy to get hold of here so I'll pass on that.
Too bad.

The difference between SPDIF transformers with screen and plain one sis quite large.

Ciao T
  Reply With Quote
Old 5th December 2011, 07:46 AM   #84
Sin Bin
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 84
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by ThorstenL View Post
The difference between SPDIF transformers with screen and plain one sis quite large.
Scientific Conversion, Inc. - Transformers and Inductors

Which one(s) did you measure and what measurements did you make?
  Reply With Quote
Old 5th December 2011, 08:04 AM   #85
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by abraxalito View Post
Which one(s) did you measure and what measurements did you make?
I tested a different manufacturers screened and unscreened parts. The difference in leakage inductance is quite large. The larger leakage inductance makes getting a sufficiently bandwidth with optimum damping of ringing near impossible in practice.

Ciao T
  Reply With Quote
Old 5th December 2011, 08:47 AM   #86
Sin Bin
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 84
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Can't see the point of having a screen there myself - the common-mode noise isn't stopped by the screen, it still goes somewhere inside the DAC. What marketing ploy did that manufacturer use to make you interested in even getting hold of a screened part to test?
  Reply With Quote
Old 5th December 2011, 05:00 PM   #87
diyAudio Member
 
Join Date: Dec 2004
Location: gran sasso
Ok, so maybe it's time for You to re-evaluate the SC transformers - almost all of them, but the most publicized surely, are screened ones?
Their marketing ploy is common -mode rejection..

Ciao, George
  Reply With Quote
Old 5th December 2011, 05:10 PM   #88
Sin Bin
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 84
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
If by 'You' you mean me, I've never had a SC part to evaluate. On paper they look impeccable, they even show jitter plots versus unnamed 'competitor' parts. But they're single sourced and a bit on the expensive side so I'm not a customer - yet.

Incidentally, when they say 'shielded' does that mean magnetically shielded or having an interwinding screen? I'd assume the former but it would be nice if they'd clarify this point.
  Reply With Quote
Old 5th December 2011, 05:37 PM   #89
diyAudio Member
 
Join Date: Dec 2004
Location: gran sasso
Only because they call it differently, it is still a screening.

Look at the last figure in this document, what does pin 2 do in the application?

Scientific Conversion, Inc. - Transformers and Inductors

In their other documents earlier available on the net, they were even more explicit about it.

Ciao, George

P.S.: Did You notice also those ferrite beads on the input?

Last edited by Joseph K; 5th December 2011 at 05:39 PM.
  Reply With Quote
Old 6th December 2011, 01:01 AM   #90
Sin Bin
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 84
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
I downloaded their AES paper, yes they do show an explicit screen and they show it connected to earth on the schematic. What's unclear then is how the capacitance measurements apply - 3.0pF or 0.5pF and between which terminals?

Yes I noticed the ferrite beads and CM choke too, with CM suppressing caps after. Is there something wrong with using them? To me it shows they do take CM noise seriously.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: NOS Quad TDA1543 + CS8414 SPDIF DAC Board pftrvlr Swap Meet 5 8th June 2010 12:00 AM
FS: NOS Quad TDA1543 + CS8414 SPDIF DAC Board pftrvlr Swap Meet 3 20th April 2010 07:06 AM
FS: NOS Quad TDA1543 + CS8414 SPDIF DAC Board pftrvlr Swap Meet 0 26th July 2009 08:28 PM
Micro Jacks and Micro Pins for board-board connection jazzist Parts 1 12th May 2008 03:02 PM
Selling CS8414 to CS8412 converter board spencer Swap Meet 8 1st May 2007 07:08 AM


New To Site? Need Help?

All times are GMT. The time now is 05:11 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2