An idea! Fully balanced TDA1541A DAC idea. Please comment! - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 16th July 2007, 05:26 PM   #1
diyAudio Member
 
cartman's Avatar
 
Join Date: May 2005
Location: Europe
Send a message via ICQ to cartman
Thumbs up An idea! Fully balanced TDA1541A DAC idea. Please comment!

Hi Guys!

I have an idea to make a fully balanced TDA1541A DAC.


It could works?

Thx!
Attached Images
File Type: jpg fully balanced tda1541a dac.jpg (35.8 KB, 558 views)
  Reply With Quote
Old 16th July 2007, 05:43 PM   #2
diyAudio Member
 
Join Date: Jun 2007
Yes it would work but you would not get the really cool benefits of running it balanced.

So use this instead:

http://www.pedjarogic.com/1541a/I2Sbal_split.htm
  Reply With Quote
Old 16th July 2007, 06:15 PM   #3
diyAudio Member
 
cartman's Avatar
 
Join Date: May 2005
Location: Europe
Send a message via ICQ to cartman
Thanks Tazz for the comment...

...but I really don't see why better the Pedja's method?

Maybe the channel separation is better, but at my idea, the RCA and XLR outputs are simply to operate.

What do you think?
Why isn't good this method than Pedja's?
Attached Images
File Type: jpg fully balanced tda1541a dac.jpg (40.3 KB, 460 views)
  Reply With Quote
Old 16th July 2007, 06:19 PM   #4
diyAudio Member
 
cartman's Avatar
 
Join Date: May 2005
Location: Europe
Send a message via ICQ to cartman
Perhaps the phase inverter would be more simple than i2s splitter...
  Reply With Quote
Old 16th July 2007, 07:15 PM   #5
diyAudio Member
 
Join Date: Jun 2007
You could read the threads about how to decouple the tda1541a lots of pointers there.

For one thing running one dac differential would make the complimentary audiocurrents flowing trough Va+ constant, wich would be most desireable.
  Reply With Quote
Old 16th July 2007, 09:00 PM   #6
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
the way the 1541 is built, the AC current going to the supply pin is the same as the current in both outputs

so if you have a classical L/R implementation, it's just 2 separate channels

on the other hand, if you have L+/L-, the AC supply current becomes (L-)+(L+) so L-L=0
you get only (or almost) a DC supply current to the chip, making the regulation, decoupling, PSSR, problems almost disappear
__________________
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
  Reply With Quote
Old 17th July 2007, 12:47 AM   #7
X.G. is offline X.G.  China
diyAudio Member
 
X.G.'s Avatar
 
Join Date: Sep 2003
Location: GuangDong China
the best way is to make a glue logic for working in sim' mode of TDA1541, like this by CPLD:

http://www.cdream5.com/htm/blance_dac1541A.htm
http://www.cdream5.com/htm/I2S_MK.htm

  Reply With Quote
Old 17th July 2007, 03:25 AM   #8
Account Disabled
 
Join Date: Jan 2006
Location: whereisit
I have always wondered, why not use sign magnitude loading with dual dac like TDA?
  Reply With Quote
Old 17th July 2007, 08:18 AM   #9
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
Quote:
Originally posted by X.G.
the best way is to make a glue logic for working in sim' mode of TDA1541, like this by CPLD:

http://www.cdream5.com/htm/blance_dac1541A.htm
http://www.cdream5.com/htm/I2S_MK.htm


why is it better?
__________________
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
  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
First Watt balanced gainclone idea mikelm Chip Amps 38 11th May 2011 04:47 PM
SE to Balanced tube preamp idea hollow_man Tubes / Valves 33 1st October 2009 06:44 PM
Balanced compound-IGBT power amp idea revintage Solid State 10 21st January 2008 04:27 PM
idea of a cost-no-subject, fully hornloaded speaker angeloitacare Multi-Way 11 23rd April 2007 11:37 AM


New To Site? Need Help?

All times are GMT. The time now is 03:23 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