WEILIANG DAC5 - WM8741 & Tenor TE7022 - Page 31 - 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 22nd August 2013, 06:31 PM   #301
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
Kent, I have been trying a different biasing setup for the opa627, and it sounds great. The board came with too low of a resistor on the I/V opamps, had distortion. I replaced it with a 2.3K, and it now has less congested bass, better mids.

I am still waiting for my LME49720HA to come, will try that in the output as you have done.

How is your setup working?
  Reply With Quote
Old 22nd August 2013, 07:07 PM   #302
Dr_EM is offline Dr_EM  United Kingdom
diyAudio Member
 
Dr_EM's Avatar
 
Join Date: Oct 2006
Location: Swindon
Quote:
Originally Posted by Buccaneer View Post
Hi,

I too want to use the minishow0328 TE7022 USB module / board as a standalone USB to S/PDIF interface dev board.

minishow0328 has generally been helpful but hasn't been able to help with my problem - then again the guy's a vendor selling with small margins, there is no reason he should help with such unintended use of the board.

Dr.M, did you have any luck?

Mine is connected, I'm powering by supplying +8V DC to pin 4 (Pins 5&6 are ground; the USB interface goes to pins 1,2,3).

The PC recognises a USB connection but says it is faulty and seems not to have loaded the driver, which is installed on the PC. I'm wondering if this is due to absent signals that would normally come from the DAC mobo?
Only just noticed this, sounds like you got the pin-out for the board as I did and have it linked up just the same. Unfortunately the problem you report is exactly what I found, it would just never pick up the device over USB. I didn't have limitless time since it was for a University project so I resorted to using a somewhat more expensive CM6631 based USB-I2S PCB, which does work beautifully.

I really couldn't fathom what it was preventing the Tenor board communicating over USB and tried connecting wires directly in case breadboard capacitance was an issue but to no avail. All the voltages on board were fine, including the 1.8V the Tenor IC regulates itself. There's no extra input to this board that could make it behave differently as far as I could see. If you ever do get it working I'd be keen to hear, it's potentially a high value respectable quality interface.
  Reply With Quote
Old 27th August 2013, 03:53 PM   #303
diyAudio Member
 
Join Date: Dec 2010
Default DAC 7 Ver 1.1 high sample rate issue

Hi Weiliang,

Recently I bought a DAC 7 ver1.1 and I paired it with hiface 2 (24/192 Async USB to S/PIF). There were some clicking sound while play audio file with sample rate higher than 96khz. I also tried to turn all the switches to ON and play 24/192 source only and I heared no sound at all, but no problem with CD quality.

I had tested the hiface 2 at the repair center with their 24/192 DAC, it seems to work fine.

Is the DAC broken ? Can you please help ?


Thanks,
Alan
  Reply With Quote
Old 8th September 2013, 06:36 PM   #304
diyAudio Member
 
triode_al's Avatar
 
Join Date: May 2004
Location: Westland
Blog Entries: 1
Quote:
Originally Posted by Buccaneer View Post
---------------------

TE7022L pinouts and basic data are linked from manufacturer's website here:
TE7022L - GFEC

Since my last post by co-incidence within 5 minutes I got another email from minishow0328 [that's an eBay handle by the way and I can vouch he is a very good eBayer with good English].. I now have schematics for the USB interface daughter card. Won't post them here as they are someone else's work -but I think it's fair use to give the CONA pinouts for the daughter board:

_Pin________Funct___
01 USB Vbus
02 USB DM
03 USB DP
04 D8V (8V dc in from DAC)
05 GND
06 GND
07 LRCK2
08 DATA2
09 BCK2
10 SCK2

I assume pins 7 through 10 are the I/\2S interface to the DAC.

The TE7022L SPDIF pins do not go anywhere on this little board except of course for the pads on the IC outline, but it should be possible to connect to them with a couple of bits of kynar wire. So far I haven't done anything about that as getting the USB endpoints established first seems the logical way to proceed.

If anyone else here has tried this, I'd love to know how you got on...
What is the function of the pin 04 (8V in from the DAC), does it set anything?
In other posts with pin information the pin 4 is not connected.
__________________
DAC TDA1541 S1; Kondo post-I/V filter; MC30-Super --> two stage RIAA; Pre: SP-6 clone ; F5 ; 300B PP ; ESL 57
  Reply With Quote
Old 11th September 2013, 02:01 PM   #305
diyAudio Member
 
Join Date: Dec 2011
Location: Hong Kong
Quote:
Originally Posted by phase View Post
Kent, I have been trying a different biasing setup for the opa627, and it sounds great. The board came with too low of a resistor on the I/V opamps, had distortion. I replaced it with a 2.3K, and it now has less congested bass, better mids.

I am still waiting for my LME49720HA to come, will try that in the output as you have done.

How is your setup working?
i did replaced more components , sound was getting better and better ,until.....

unfortantely, while i tried replaced the wm8741 AVDD regulator(LT1083-T) with a fixed 1083 5v output, i've blow something again, 2 of the pins grew red hot(analogue output) and the unit was dead, AGAIN. so desperate...

i did order a 8740 for trail and error, but it didnt get a coax lock signal, find very struggle to fix it.

brought the es9018 kit from weilang, sound was so good.

May you share which resistor replaced with a 2.3k?
  Reply With Quote
Old 14th September 2013, 05:23 PM   #306
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
Kent, very sorry to hear about your 8741 troubles, I hope you can get it back again soon.
I have removed the biasing resistors for my opa627, and replaced them with 2.2K resistors directly on the opa627 pins of each op amp. The sound is great now, way better then before, might try 2K resistors, but I like it now.
Next are mundorf AG in power supply main...
  Reply With Quote
Old 16th September 2013, 08:58 PM   #307
RajkoM is online now RajkoM  Bosnia and Herzegovina
diyAudio Member
 
Join Date: Feb 2009
Default Back to DAC5

Back to the post No. 111
Finally had time to do a little work on my DAC5. Courtesy of Mr Weiliang I got a scheme, and immediately saw that WM8741 analog PSU is possible to significantly improve. Original PSU is simplest possible - LM317 with two resistors and two capacitors, nothing less nothing more.

For simplicity I chose to make a PSU with LM7808 and cascading cap. multiplier on output. Everything is located on a small PCB 2x2 cm and were used on both sides of the PCB.
Final capacitor is my favorite capacitor for audio - Styrene. Placed close to the DAC chip.

Their efforts paid off. I recommend to all owners of this DAC that changes the analog PSU for WM8741.

Best diying
Attached Images
File Type: jpg WM8741_Analog PSU.jpg (22.5 KB, 233 views)
File Type: jpg WM8741_Analog PSU-ACanalysis.jpg (64.8 KB, 224 views)
File Type: jpg WM8741_Analog PSU-Zout.jpg (62.9 KB, 221 views)
  Reply With Quote
Old 17th September 2013, 07:51 AM   #308
diyAudio Member
 
triode_al's Avatar
 
Join Date: May 2004
Location: Westland
Blog Entries: 1
Quote:
Originally Posted by RajkoM View Post
Back to the post No. 111
Finally had time to do a little work on my DAC5. Courtesy of Mr Weiliang I got a scheme, and immediately saw that WM8741 analog PSU is possible to significantly improve. Original PSU is simplest possible - LM317 with two resistors and two capacitors, nothing less nothing more.

For simplicity I chose to make a PSU with LM7808 and cascading cap. multiplier on output. Everything is located on a small PCB 2x2 cm and were used on both sides of the PCB.
Final capacitor is my favorite capacitor for audio - Styrene. Placed close to the DAC chip.

Their efforts paid off. I recommend to all owners of this DAC that changes the analog PSU for WM8741.

Best diying
Do you set the output to 5 volts?
Is that also on the Vb pin of the connector (pin 1)?
__________________
DAC TDA1541 S1; Kondo post-I/V filter; MC30-Super --> two stage RIAA; Pre: SP-6 clone ; F5 ; 300B PP ; ESL 57
  Reply With Quote
Old 17th September 2013, 08:28 AM   #309
RajkoM is online now RajkoM  Bosnia and Herzegovina
diyAudio Member
 
Join Date: Feb 2009
Quote:
Originally Posted by triode_al View Post
Do you set the output to 5 volts?
Is that also on the Vb pin of the connector (pin 1)?
Yes, Vout is 5V. Set this voltage with 5K trimpot.
"Conector pin 1"..... You mean pin1 on 7808 or what?
  Reply With Quote
Old 18th September 2013, 01:58 PM   #310
RajkoM is online now RajkoM  Bosnia and Herzegovina
diyAudio Member
 
Join Date: Feb 2009
Two days of listening is enough for capacitors to "settled down".
I controlled output voltage of my new regulator. Dropped to 4.88 V on DMM. I set it to 5V and closed the box.

Really step up in sound quality.
  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 03:06 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