Buffalo II - Page 9 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Twisted Pear

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 28th February 2010, 10:17 PM   #81
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally Posted by glt View Post
Does the diagram imply that half the dacs of one ESS are in anti-phase mode?

If all the DACs are in-phase, wouldn't it be simpler to just connect both +V and both -V of one DAC together and then use a single IVY?
Sure it would be simpler, sort of, but it would not be symmetrical. It is the symmetry which in part produces the superb dynamic range and low distortion we can achieve.

There is a very good reason the "off-side" is anti-phase and it would not be optimal to use one IVY-III and two DAC modules, but it is certainly still possible, and not hard to do.

The very important reason the DAC is designed to stack with the IVY-III module is that our testing has shown that the signal symmetry and length are key to good performance, and in no small way. It is critical. By keeping the signal lengths exactly the same length and very very short we improve dynamic range.

That said if you *really* wanted to, you could indeed take the anti-phase side and simply wire it in phase to the same side of an IVY-III as the in-phase side. But, that kind of wiring compromise is likely to completely defeat any gains you might have other wise had in dynamic range. You would be surprised what a couple inches of inductance and EMI antennae can do.

What I have done is actually a very common way to route dual mono DACs. TI and Wolfson both work this way as well in mono mode, and for very good reason. It is not new territory I am charting here. Take a loof at those data sheets.

When I called TI a few years ago about why they designed the PCM1794A this way I did not really get it. Now I do.

I am pretty confident if the ES9018 had a hardware mono mode it would also work this way.

So now you should have a good idea why it is anti-phase. Of course, how you wire it is completely up to you.

Cheers!
Russ
__________________
Less pulp more juice Twisted Pear Audio.

Last edited by Russ White; 28th February 2010 at 10:41 PM.
  Reply With Quote
Old 1st March 2010, 02:13 AM   #82
glt is offline glt  United States
diyAudio Member
 
Join Date: Oct 2004
Hi Russ, thanks for the explanation. I have no doubt careful wiring is required to improve on the DNR (I know that's why you designed Buf32s). Just wanted to know how things operate. The data sheet is just bare minimum in comparison to Wolfson or BB data sheets. I wasn't sure if setting the DAC in mono mode you still had the option of setting the phase of the individual DACs,
__________________
www.hifiduino.wordpress.com
  Reply With Quote
Old 2nd March 2010, 11:19 PM   #83
toufu is offline toufu  United States
diyAudio Member
 
Join Date: Jun 2008
Location: San Francisco
Can we connect the buffalo II to an unbalanced I/V output module such as the Lampizator or the Tubizaotor offered here as a group buy? Thanks.
  Reply With Quote
Old 3rd March 2010, 01:17 AM   #84
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally Posted by toufu View Post
Can we connect the buffalo II to an unbalanced I/V output module such as the Lampizator or the Tubizaotor offered here as a group buy? Thanks.
Absolutely. But you will likely want to AC couple.

Cheers!
Russ
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 3rd March 2010, 01:54 AM   #85
diyAudio Member
 
Join Date: Feb 2004
Location: Davis,CA
Quote:
Originally Posted by toufu View Post
Can we connect the buffalo II to an unbalanced I/V output module such as the Lampizator or the Tubizaotor offered here as a group buy? Thanks.
The Lampizator also shows a balanced circuit based on Voltage out

BuffaloDAC

I am going to try Ron Welborne's Cato module set up as a passive I/V converter for DACs with differential output. This a low voltage unit that I have used with 6GM8s,7308s and 6H(N)6Ps.

DAC Tube Output Stage Kit

Hope it is OK to put this reference. Apologies if not.

Russ - what resistor value should be used for this passive conversion.

Thanks

Bob
  Reply With Quote
Old 3rd March 2010, 04:21 PM   #86
diyAudio Member
 
Join Date: Nov 2004
Location: BALTIMORE MD
Cannot find any reference to "Tubizaotor" toufu, can you please help?
  Reply With Quote
Old 3rd March 2010, 04:44 PM   #87
toufu is offline toufu  United States
diyAudio Member
 
Join Date: Jun 2008
Location: San Francisco
Spelling error on my part, this is the thread:

Tube-I-zator Professional PCB
  Reply With Quote
Old 3rd March 2010, 04:44 PM   #88
diyAudio Member
 
Join Date: Feb 2004
Location: Davis,CA
here is the web site

Tube-I-zator Professional PCB
  Reply With Quote
Old 3rd March 2010, 04:50 PM   #89
glt is offline glt  United States
diyAudio Member
 
Join Date: Oct 2004
Quote:
Originally Posted by flocchini View Post
The Lampizator also shows a balanced circuit based on Voltage out

BuffaloDAC


Russ - what resistor value should be used for this passive conversion.

Thanks

Bob
39 ohm according to the lampizator link you provided :-)
__________________
www.hifiduino.wordpress.com
  Reply With Quote
Old 3rd March 2010, 05:07 PM   #90
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ
Quote:
Originally Posted by toufu View Post
Can we connect the buffalo II to an unbalanced I/V output module such as the Lampizator or the Tubizaotor offered here as a group buy? Thanks.
Quote:
Originally Posted by Russ White
Absolutely. But you will likely want to AC couple.
Not quite sure why you would want to though...
__________________
Twisted Pear Audio
  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
Buffalo Tweaking jkeny Digital Line Level 316 10th March 2010 09:14 PM
Hello from Buffalo NY chris emo Introductions 1 13th July 2007 04:24 AM
Buffalo brains macmeech Introductions 1 15th June 2004 06:03 PM


New To Site? Need Help?

All times are GMT. The time now is 01:24 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