Wolfson WM8740 DIR9001 PCM2706 DIY DAC - Page 10 - 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 11th January 2012, 06:00 PM   #91
Nomdi is offline Nomdi  France
diyAudio Member
 
Join Date: Sep 2011
thanks dtses !
Did you try to connect it to the board
through a 7805 regulator ?
I guess that could be the problem...
  Reply With Quote
Old 11th January 2012, 08:19 PM   #92
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
yes, it's connected to the board, just look where you could get +5v to feed 74HCT04.
  Reply With Quote
Old 11th January 2012, 09:25 PM   #93
Nomdi is offline Nomdi  France
diyAudio Member
 
Join Date: Sep 2011
ok i ll give it a try
thanks !
  Reply With Quote
Old 12th January 2012, 04:58 PM   #94
Nomdi is offline Nomdi  France
diyAudio Member
 
Join Date: Sep 2011
hi @ all !
I guess my problem is more important
that just a Toslink connection .
I ve checked the outputs : the right channel
can be set to less than 0.2 mV of DC offset .
it's ok.
but on the left channel the DC offset is
more than 500mV and cannot be modified
using the 1k trimmer !!! that's the real problem !
i ve checked connections : everything is ok
and all the voltage regulators delivers the right
voltage...
I ve changed the OP AMP many times
but with no results ... the music is here
on both channel but with an anormal
DC offset on the left channel ...
Any idea ?

Last edited by Nomdi; 12th January 2012 at 05:00 PM. Reason: typo
  Reply With Quote
Old 12th January 2012, 08:15 PM   #95
50AE is offline 50AE  Bulgaria
diyAudio Member
 
Join Date: Jul 2011
Location: Sofia, Bulgaria
I seem to get interested in this kit. Has someone compared it to this kit: DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 ?

I wonder if I will get much better music playback. My AK 4393 is modded with better caps and regulators.

Can I be able to get 24/96,192 form USB with this?
  Reply With Quote
Old 12th January 2012, 10:24 PM   #96
diyAudio Member
 
cobretti's Avatar
 
Join Date: Feb 2011
Location: Taxachusetts
Quote:
Originally Posted by Nomdi View Post
hi @ all !
I guess my problem is more important
that just a Toslink connection .
I ve checked the outputs : the right channel
can be set to less than 0.2 mV of DC offset .
it's ok.
but on the left channel the DC offset is
more than 500mV and cannot be modified
using the 1k trimmer !!! that's the real problem !
i ve checked connections : everything is ok
and all the voltage regulators delivers the right
voltage...
I ve changed the OP AMP many times
but with no results ... the music is here
on both channel but with an anormal
DC offset on the left channel ...
Any idea ?
Check values of all resistors and capacitors in output stage around the OPamps. It could also be a bad solder joint around trim pot if you say it can not be adjusted.

Last edited by cobretti; 12th January 2012 at 10:35 PM.
  Reply With Quote
Old 12th January 2012, 11:03 PM   #97
kmbois is offline kmbois  United States
diyAudio Member
 
Join Date: Sep 2008
Send a message via Yahoo to kmbois
Default i love this DAC!

I bought it to replace one my gigaworks DACs and it blew it away sonically.
I am using it in a very revealing setup and this DAC just sounds amazing with very minor tweaks. I removed the rca plugs and hardwired some cables with eichmann bullet plugs and I use the R-core transformer that came with the gigaworks kit. You cannot go wrong for the price.
  Reply With Quote
Old 13th January 2012, 06:02 PM   #98
diyAudio Member
 
merlin2069er's Avatar
 
Join Date: Sep 2008
Location: Toronto
Blog Entries: 1
Send a message via MSN to merlin2069er
I've got a arduino mega and I've picked up an LCD display for it awhile back.

Just wondering if the code that came with the dac.zip will output anything to a display? It would be cool if it displayed some info.
  Reply With Quote
Old 16th January 2012, 06:35 PM   #99
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
Has anybody done some tweaks regarding opams' power supply? Seems that combination of 7812 & 7912 could be significantly improved by Salas shunt regulator (scheme attached) ...

I'm working on simple headphone preamp (based on LME49720HA) for the dac (att.) and I guess Salas shunt reg would perfectly serve there. So perhaps that could be implemented for output opams as well.

some other improvements?!
Attached Images
File Type: jpg Cricuit-SALAS-LOW-VOLTAGE-S.jpg (350.8 KB, 460 views)
File Type: gif vv-schaltplan.gif (6.4 KB, 452 views)
  Reply With Quote
Old 16th January 2012, 07:52 PM   #100
diyAudio Member
 
cobretti's Avatar
 
Join Date: Feb 2011
Location: Taxachusetts
I was thinking myself to use Jung super regulators from Sjostrom but don't have enough time to do it. I am not sure if there would be any significant improvement though. I would first try in improve the clock itself and maybe reclock the data, then I would deal with analog output. But the DAC is damn good in its original configuration for sure. Just use brand name components, no chinese fakes.
  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
cs8414 & wm8740 dac (one dac chip) sparkle Digital Line Level 28 28th March 2012 01:10 PM
New WM8740 DAC lordearl Digital Source 4 3rd May 2010 09:51 AM
DIY Dac PCBS ( DIR9001,DF1706,PCM1704) rudee Swap Meet 1 22nd April 2009 02:04 AM
Problem DIY DAC / WM8740 ah79 Digital Line Level 7 14th March 2009 05:20 PM


New To Site? Need Help?

All times are GMT. The time now is 05:07 AM.


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