WEILIANG DAC5 - WM8741 & Tenor TE7022 - Page 6 - 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 14th July 2012, 08:31 AM   #51
diyAudio Member
 
Join Date: Aug 2009
Bob, sorry it didn't just play. But this is DIY!

It seems the OP275 is a reasonable substitute for the OPA2604, given a quick glance at spec sheets.

My unit came with NE5532's at the position you marked B, and NE5534's at C. It worked just fine. If you have some of those extremely common op-amps bouncing around in your parts drawer, you might try a quick substitution to see what happens.

Otherwise, it is probably time to dig out the o'scope, if you have one. It is encouraging that you can hear something coming out, however faint and scratchy. You should be able to trace a test tone backwards from the output to the DAC chip.

Al, thanks for posting all those measurements. I continue to be impressed with the measured performance of your EMU0204. Have you listened to it playing music and comparing it to the DAC6?

Dave
  Reply With Quote
Old 14th July 2012, 10:22 AM   #52
alkasar is offline alkasar  France
diyAudio Member
 
Join Date: Jan 2009
Location: near Paris, France
Quote:
Originally Posted by dhalbakken View Post
Al, thanks for posting all those measurements. I continue to be impressed with the measured performance of your EMU0204. Have you listened to it playing music and comparing it to the DAC6?

Dave
Yes this soundcard has excellent measured performance and sounds very well too It's based on the well recognized AKM4396 used in many pro devices. For the price, it's a killing device.

I own quite a bunch of dacs and mostly listen via USB.
The previous winning configuration was a dir9001+AD1995 dac board. I used it with an additional board for 24/96 USB input with TE7022, built by Weiliang. Unfortunately the main dac board has a broken part, lead me to try a wolfson dac.

This experience confirmed that TE7022 gets a lot more out of USB than the traditional usb 16/48 receivers. I also own an even more powerful USB receiver based on TE8802 (24/192) twice as expensive and works asynchonously which is supposed to be the ultimate against jitter. But frankly, I could not hear any difference with 7022 wich is 24/96 only.

Listening tests are quite subjective. Use with precaution
I like very much the EMU0204. Very detailed and "smooth". Very pleasant listening experience. This AKM dac is awesome

The ad1955 + TE7022 is the most precise dac I ever heard. Wide soundstage, clear, detailed and not aggressive. I had a CS4398 dac that was precise as well, but I found sometimes agressive.

I have not listen much to weiliang DAC6 : despite it measured not as good, in listening situation it clearly plays in the same league as the other two.


Many people think that opamp used in the output stage impacts the sound . I tried to swap the opamps in my AD1955 dac with LME49720 for example and others. I perceived no real change, at best some self-suggested perception Will try with DAC6 if it makes a significant difference.
  Reply With Quote
Old 14th July 2012, 11:25 AM   #53
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Hi Pete,

Unless I have a different board or mine is mislabeled, there is a different function here. I didn't try optical as I remembered what was under that socked. Could that be a tow-way connection? I would assume not as s/pdif requires two cables for in/out operation.

Also downloaded and installed USB driver from post #40. No improvement and the programs GUI says no device connected.

The "Off Noise" zip is a recording of a horrible sound produced by unplugging the DAC with amp/speakers on. Maybe someone can confirm if it is normal for this unit.

Thanks for the suggestions on opamps. I'll order a few and try them. As some of the regs in the kit were used (all new now) there is no telling what condition opamps were in.
Attached Images
File Type: jpg VCC OUT.jpg (177.9 KB, 811 views)
Attached Files
File Type: zip off noise.zip (421.5 KB, 26 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

Last edited by bcmbob; 14th July 2012 at 11:31 AM.
  Reply With Quote
Old 14th July 2012, 12:20 PM   #54
repeet is offline repeet  Australia
diyAudio Member
 
Join Date: Oct 2009
Location: Brisbane
This was sent to me by ebay seller minishow. Mine is version 1.7 though.
Attached Images
File Type: jpg DAC5 two switches.jpg (244.3 KB, 799 views)
  Reply With Quote
Old 14th July 2012, 12:35 PM   #55
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Thanks Pete, I have V1.3 and can see many differences compared to yours. The output/opamp sections look the same but the input, crystal and cap arrangements are not the same circuits.

I did send a message to mindshadow who may have some knowledge of the earlier versions. Hope he replies.
Attached Images
File Type: jpg 20120714_082430.jpg (154.4 KB, 776 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 15th July 2012, 08:13 AM   #56
diyAudio Member
 
Join Date: Aug 2009
Bob,

I listened to your "off noise." Sure sounds awful. Is this what you get when you turn off power to your DAC5? When I switch power on and off to mine, it seems absolutely quiet; no noticeable sound comes from the speakers.

Have you checked the DC output from all the voltage regulators? Have you confirmed that all polarized capacitors are installed correctly? Have you checked the + and - DC supply on all ICs?
  Reply With Quote
Old 15th July 2012, 08:35 AM   #57
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
I was wondering what I was going to do to fill up the afternoon.

Correct - didn't install an AC switch yet, but that's the result of unplugging.

I'll re-check caps, probe for voltages and report what is found.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 24th July 2012, 12:20 PM   #58
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Finally got a chance to do some readings. Any clues here?
Attached Images
File Type: jpg MW Read.jpg (123.4 KB, 715 views)
File Type: jpg MW Read 2.jpg (159.6 KB, 705 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 24th July 2012, 12:51 PM   #59
alkasar is offline alkasar  France
diyAudio Member
 
Join Date: Jan 2009
Location: near Paris, France
so the regulators are soldered on the bottom side. Interesting.

There is something weired: the output of LM317 should be around +12Vdc to ground. (7.9V is not correct). LM337 around -12V (it outputs positive voltage !).
7808 arounf 8Vdc . Not sure what 1085 is used for, but negative voltage on all pins is wrong.
Check the regulators datasheets to findout pin order and meaning to identify input and output. lm337 negative regulator pin order is different from lm317 positive regulator. I don't think you can mess the orientation on the board.
do you measure voltages to ground ? is the transformer wired correctly ? are the rectifying diodes all in the right orientation ?
  Reply With Quote
Old 24th July 2012, 01:03 PM   #60
alkasar is offline alkasar  France
diyAudio Member
 
Join Date: Jan 2009
Location: near Paris, France
I just rechecked the schematic : the 6 small regulators at the bottom are 5x 3V3 and 1x 5V regulators. They should have 8V as input (coming from 7808).
7.91V is correct. The bottom measurements are ok.

ps:1085 is 5V regulator used for wm8741 analog. You should measure 5V at it's output.
  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
Info on Tenor TE7022? chaparK Digital Source 22 19th December 2013 11:02 AM
Mission DAC5 (DAC7 chipset) ash_dac Digital Source 7 24th September 2009 01:03 PM
Gran Tenor juliovideo Tubes / Valves 14 16th July 2009 09:19 PM
so who owns a dac5 or m8 phono amp builder jb Tubes / Valves 0 21st July 2005 08:47 PM
Dac5 Norbert Digital Source 2 9th June 2003 09:26 AM


New To Site? Need Help?

All times are GMT. The time now is 07:09 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