"Reference" TDA1541A DAC with I2S-BUS architecture - Page 76 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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
View Poll Results: Surface Finish for future PCBs
ENIG - Electroless Nickle/Immersion Gold 55 45.45%
Immersion Silver 36 29.75%
Immersion Tin 18 14.88%
OSP - Organic Solderability Preservatives 12 9.92%
Voters: 121. You may not vote on this poll

Reply
 
Thread Tools Search this Thread
Old 17th August 2011, 05:20 AM   #751
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
I can advise you here neda, as I have also faced this issue.

This is related to the use of two sets of shunt regulators. The Salas shunts are more than capable of supplying excellent, consistent and ripple-free supply to the DAC, but the TL431 shunt regulators that are in the way make things less simple.

Essentially, you have two options.

Option one, which is by far the simplest, and something you should try until you get a chance to operate and go with Option two, is to turn the Vout of the Salas shunts up to around 7vDC -7vDC -17vDC, which will supply the TL431s with sufficient voltage that they have some work to do. This should solve your immediate problems (but do check their output voltages are around 5v -5v & -15v).

Option two, is something that I was the first to do with this project. Remove the TL431s and all associated Cs & Rs. It is all discussed in great depth in this thread, and Oliver gave some great advice on where to "inject" the Salas shunts after removing the TL431s. The improvement is considerable. Several people have tried this, and all have so far recorded improvements. Oliver's latest V3.0 DAC board is basically a neater version of the de-TL431-ed board, with some refinements, I believe.
__________________
Lucas

Last edited by LucasAdamson; 17th August 2011 at 05:29 AM.
  Reply With Quote
Old 17th August 2011, 05:23 AM   #752
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 38
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by neda View Post
Hi Oliver,

I fired up my DAC for the first time last night, and everything seemed to work fairly well. I'm using a CD player with digital out as a transport. I'm using the Twisted Pear SPDIF converter through your high speed buffer.
Today I turned it on, and I'm getting music out of the the left channel only.
When I turned up the regulator supplying them to 5.5v I got sound out of both channels but it was very distorted.

Any ideas?

Ned
Hi Ned,

please post some pictures of your setup. I would like to look especially to the DIP-Switches on the TP SPDIF converter.


__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 17th August 2011, 05:26 AM   #753
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 38
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by LucasAdamson View Post
I can advise you here neda, as I have also faced this issue.

This is related to the use of two sets of shunt regulators. The Salas shunts are more than capable of supplying excellent, consistent and ripple-free supply to the DAC, but the TL431 shunt regulators that are in the way make things less simple.

Essentially, you have two options. The first option, which is by far the simplest, and something you should try until you get a chance to operate and go with the second option, is to turn the Vout of the Salas shunts up to around 7vDC -7vDC -17vDC, which will supply the TL431s with sufficient voltage that they have some work to do. This should solve your immediate problems (but do check their output voltages are around 5v -5v & -15v).

Option two, is something I was the first to do with this project, and many others have now, like me, recorded improvements with. Namely, remove the TL431s and all associated Cs & Rs. It is all discussed in great depth in this thread, and Oliver gave some great advice on where to "inject" the Salas shunts after removing the TL431s. The improvement is considerable. Oliver's latest V3.0 DAC board is basically a neater version of the de-TL431-ed board, with some refinements, I believe.

__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 17th August 2011, 05:54 AM   #754
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
Quote:
Originally Posted by wlowes View Post
Nice choice. Of course the coupling caps are a key part. I am running Obligato PIO 2u. Work well. Russian KBG are a step up. I bypassed them with .1u Russian Tefon, and the HF opened up a new window. Very cost effective.

I suspect the quality of R1 and R2 are equally important, but I have yet to test. I did add a cathod bypass cap to R1, and like the effect. just put a 150u 16v Oscon SEP on the resistor. It added more grunt and texture to the lower end.

B+ power quality counts but not as much as cap choice. adding good transformer and a choke cleared away a little haze.
Lukas "Lampizator" Fikus has also staked his reputation on the fact that, when he set up an immediate A, B test to determine differences between output DC blocking, or "coupling" caps, he couldn't determine any single difference between any of them, including cheap electrolytic ones.

Go figure!

captest1

It certainly is an interesting read, and perhaps suggests what many have suspected all along - that the cost and effort of upgrading certain parts, along with the excitement of doing so, coupled with the time lag it takes to perform an operation on our gear, creates a powerful psycho-acoustic effect. Only live A, B switching can determine the best part, I feel.
__________________
Lucas
  Reply With Quote
Old 17th August 2011, 04:04 PM   #755
neda is offline neda  United States
diyAudio Member
 
neda's Avatar
 
Join Date: May 2008
Location: Connecticut
[QUOTE=dvb-projekt;2675191]Hi Ned,

please post some pictures of your setup. I would like to look especially to the DIP-Switches on the TP SPDIF converter.


Hi Oliver,
When I touch the meter probe to the BCK terminal of the buffer board I get distorted sound from both channels. Remove the probe, and I get clear sound from left channel only.
Attached Images
File Type: jpg DSC02545.JPG (229.3 KB, 418 views)
  Reply With Quote
Old 17th August 2011, 04:11 PM   #756
neda is offline neda  United States
diyAudio Member
 
neda's Avatar
 
Join Date: May 2008
Location: Connecticut
[
Quote:
Originally Posted by LucasAdamson View Post
I can advise you here neda, as I have also faced this issue.

This is related to the use of two sets of shunt regulators. The Salas shunts are more than capable of supplying excellent, consistent and ripple-free supply to the DAC, but the TL431 shunt regulators that are in the way make things less simple.

Essentially, you have two options.

Option one, which is by far the simplest, and something you should try until you get a chance to operate and go with Option two, is to turn the Vout of the Salas shunts up to around 7vDC -7vDC -17vDC, which will supply the TL431s with sufficient voltage that they have some work to do. This should solve your immediate problems (but do check their output voltages are around 5v -5v & -15v).

Option two, is something that I was the first to do with this project. Remove the TL431s and all associated Cs & Rs. It is all discussed in great depth in this thread, and Oliver gave some great advice on where to "inject" the Salas shunts after removing the TL431s. The improvement is considerable. Several people have tried this, and all have so far recorded improvements. Oliver's latest V3.0 DAC board is basically a neater version of the de-TL431-ed board, with some refinements, I believe.
Hi Lucas,
As you can see from the photo, I'm using option two.
The second +5v line is bridged from underneath the board.

Ned
Attached Images
File Type: jpg DSC02546.JPG (489.1 KB, 414 views)
  Reply With Quote
Old 17th August 2011, 04:18 PM   #757
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
Ah, well in that case, I'm wasting my breath.... Good luck with the Twisted Pear Module

Looks really neat, by the way. Good Job!
__________________
Lucas
  Reply With Quote
Old 17th August 2011, 04:42 PM   #758
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 38
Send a message via Skype™ to dvb projekt
[QUOTE=neda;2675848]
Quote:
Originally Posted by dvb-projekt View Post
Hi Ned,

please post some pictures of your setup. I would like to look especially to the DIP-Switches on the TP SPDIF converter.


Hi Oliver,
When I touch the meter probe to the BCK terminal of the buffer board I get distorted sound from both channels. Remove the probe, and I get clear sound from left channel only.
Hi Ned,

looks real great!

The settings on the TP are correct. Two questions:

1. Did you power up the whole DAC with an SPDIF input signal or without anything?

2. Did you try to disconnect one of the DAC modules?


__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 17th August 2011, 07:39 PM   #759
neda is offline neda  United States
diyAudio Member
 
neda's Avatar
 
Join Date: May 2008
Location: Connecticut
[QUOTE=dvb-projekt;2675908]
Quote:
Originally Posted by neda View Post

Hi Ned,

looks real great!

The settings on the TP are correct. Two questions:

1. Did you power up the whole DAC with an SPDIF input signal or without anything?

2. Did you try to disconnect one of the DAC modules?


Hi Oliver,
First I powered it up without the transport, and set all voltages then powered down. Next I connected it to the transport, powered it up, and everything worked fine.
The next day, like a fool, I decided to play with the dip switch settings to see if it had any effect on the sound, cycling on & off between switch changes. That's when my troubles began.
Could I have possibly burnt something out by cycling to quickly?

No, I did not try to disconnect one of the DAC modules. Should I?

Ned
  Reply With Quote
Old 17th August 2011, 11:58 PM   #760
neda is offline neda  United States
diyAudio Member
 
neda's Avatar
 
Join Date: May 2008
Location: Connecticut
Thank you Oliver & Lucas for your help, I found the problem!
It was what we learned on our first day of electronics 101.
Make sure your GROUNDS are tight!!!
The input gnd to the converter was loose.

We're back in buisness, and sounding good, but still have a long way to go.

Best Regards,
Ned
  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
i2s bus vs. i2c bus Doovieman Digital Source 9 5th February 2013 02:08 PM
My take to the "Reference" TDA1541A DAC with I2S-BUS architecture dvb projekt Digital Line Level 130 30th January 2011 01:54 PM
what is "ground bus"? gychang Parts 4 12th November 2007 09:21 PM
PCM2707 I2S out to TDA1541A DAC TV Man Digital Source 3 4th December 2004 05:53 PM
A real DAC Philips TDA1541A "Double Crown"? dbhh Digital Source 17 7th May 2004 05:15 AM


New To Site? Need Help?

All times are GMT. The time now is 08:04 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