Anyone tried this Ebay dac? - Page 6 - diyAudio
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 2nd April 2012, 02:03 AM   #51
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
I will change the chips next time I get some time to muck about... would be cool if just the chips made it turn into equal or similar to my main DAC...

Shipping from China is always an unknown... mine came within the expected time. Sometimes it never comes - there is some fellow somewhere with a TON of stuff, eh?

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  Reply With Quote
Old 16th April 2012, 01:04 PM   #52
Guten is offline Guten  Sweden
diyAudio Member
 
Join Date: Feb 2012
Location: Visby
Default Finnished?

How is it going? I'm qurious, how doses it sound? I am up to get a dac myself and not decided whitch one yet.
  Reply With Quote
Old 18th April 2012, 07:18 AM   #53
diyAudio Member
 
Groundloops's Avatar
 
Join Date: May 2004
Location: fubar Germany.
Quote:
Originally Posted by bear View Post
For clarity,

the seller is "zoe_tsang" on ebay

below are pix of the board.
mine was slightly different, no trimmers for one thing,
and mine is V2.0

he did not include the schematic despite several requests.

the ebay links others have posted, over time will go away and not be viewable any longer.

Upper left in the bottom side pix is the input chip that ran into the spacer...
oh, the two vregs upper right on top side run a bit hot, will need heatsinks...

_-_-bear
Schematic attached ...
Attached Files
File Type: pdf WM8740 DAC Sch.pdf (160.2 KB, 101 views)
  Reply With Quote
Old 18th April 2012, 01:01 PM   #54
diyAudio Member
 
Join Date: Feb 2012
Sorry for the wait Im im nearly DONE! Gonna be finished by the end of today! Will be posting some HD pictures too

I have tried listening to it just a little, and i must say it sounds good. But i will come more back to that when i have really testet it when im 100% done!
  Reply With Quote
Old 18th April 2012, 01:56 PM   #55
Pemo is offline Pemo  Mexico
diyAudio Member
 
Pemo's Avatar
 
Join Date: Dec 2009
Location: Echegaray, Naucalpan, Estado de México
Talking Tenor 7022

Quote:
Originally Posted by solviken View Post
Sorry for the wait Im im nearly DONE! Gonna be finished by the end of today! Will be posting some HD pictures too

I have tried listening to it just a little, and i must say it sounds good. But i will come more back to that when i have really testet it when im 100% done!
Please, don't forget pictures of how you connected the Tenor 7022 board to the DAC.

Thanks

PEMO
  Reply With Quote
Old 18th April 2012, 07:01 PM   #56
diyAudio Member
 
Join Date: Jul 2005
Location: Austria, Vienna
Quote:
Originally Posted by Guten View Post
How is it going? I'm qurious, how doses it sound? I am up to get a dac myself and not decided whitch one yet.
This DAC sounds excellent!!!
But I must mention that at the beginning I had problem with it. The DAC worked from very beginning, sound was not bad but not as good as I expected. This is my second Chinese DAC which I bought for one of my friends being extremely happy with well known CS8416+CS4398+CS8421 DAC. When I connected oscilloscope and had a look at sinus signal coming out of this DAC I was shocked. This is how it looked like.
Click the image to open in full size.
I did not had schematic because seller did not have it either. After looking at signal coming out of Vout of both channels of the WM8741 I guessed that digital part of DAC works properly and something must be wrong power supply of analogue part of the chip. It was impossible to put oscilloscope probe on chip pins due to their size and I decided re-solder all components which were on the way to those pins. Doing that I was wondering how it will sound after problem elimination. Finally the job I did helped and signal shape become as real sinus. Sound quality very much improved. After a week of intensive listening I modified the DAC by connecting transformers Monacor LTR-100 via 220R to WM8741 Vout. With new Monacor transformers sound become slightly better than with my favorite OPA LME49720 which I put in the DAC in at the first day.

Today I made sound comparison of these 2 Chinese DACs. Outputs of both DACs were connected to separate inputs of a very good tube 300B SET amplifier. DAC inputs were interconnected together and connected to PC via coax cable.

Click the image to open in full size.

I was playing different kind of music using high quality recordings including 24bit/96kHz SACD rips with Foobar2000 and doing amplifier input switchover with remote control. Signal level from CS4398 based DAC was perhaps 2-3% higher than from WM8741 based one. Sound quality of the CS4398 based DAC was also slightly better. Most probably just because transformers in that DAC (UTC A-20) are better than Monacors. After 3 hours of doing A-B test I can conclude that either both DACs provide near the same outstanding sound quality or my old ears are not able distinguish the difference.

Build quality of CS4398 based DAC is sufficiently better than the 8741 based one. PCB quality is superb. I do not like PCB quality of the 8741. Obviously not good PCB quality or bad soldering caused the problem I described above.
  Reply With Quote
Old 18th April 2012, 09:12 PM   #57
Guten is offline Guten  Sweden
diyAudio Member
 
Join Date: Feb 2012
Location: Visby
Anyone compared the sound with any other dac's? Like Cambridge Dacmagic 100 or simular.
  Reply With Quote
Old 18th April 2012, 09:35 PM   #58
diyAudio Member
 
Join Date: Feb 2012
So i tried connecting the Tenor board from the Rca out to USB in one the DAc board.. Got No sound... hmm.. i need to test more tomorrow! I will report back!


Valeri100, on my dac the components seem to be Soldered good, is there anyway an amature like me can see if its soldered bad?

Last edited by solviken; 18th April 2012 at 09:37 PM.
  Reply With Quote
Old 18th April 2012, 10:02 PM   #59
diyAudio Member
 
Join Date: Jul 2005
Location: Austria, Vienna
Quote:
Originally Posted by solviken View Post
So i tried connecting the Tenor board from the Rca out to USB in one the DAc board.. Got No sound... hmm..
Perhaps you have forgotten switch input to coaxial by pressing twice small button on the small board connected by flat cable. I noticed each time you turn on the DAC, input selector switches to optical input.
  Reply With Quote
Old 18th April 2012, 10:12 PM   #60
diyAudio Member
 
Join Date: Feb 2012
hehe Thats the First thing i thought of! So its not that! But should it go in theory? from coax out to USB in?
  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
Recommend me an eBay DAC. GloBug Digital Line Level 24 28th May 2013 05:08 PM
Ebay dac with: DAC TDA1541, AD1865, AD1955, PCM63, & CS4398! sharpi31 Digital Line Level 2 10th January 2011 07:03 AM
which ebay DAC do I want? nullstring Digital Line Level 10 20th July 2010 06:37 PM
Any experience with this ebay-dac-kit?(searching a diy-dac) xTr3Me Digital Line Level 2 31st December 2009 11:07 AM
DAC outboard from Ebay ttan98 Digital Source 0 22nd August 2007 02:24 AM


New To Site? Need Help?

All times are GMT. The time now is 08:15 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