WEILIANG DAC5 - WM8741 & Tenor TE7022 WEILIANG DAC5 - WM8741 & Tenor TE7022 - Page 21 - diyAudio
Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

WEILIANG DAC5 - WM8741 & Tenor TE7022
WEILIANG DAC5 - WM8741 & Tenor TE7022
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 23rd February 2013, 05:00 PM   #201
Dr_EM is offline Dr_EM  United Kingdom
diyAudio Member
 
Dr_EM's Avatar
 
Join Date: Oct 2006
Location: Swindon
Does anyone have the pin-out and/or schematic for the TE7022 plug-in module? I'm intending to use it to add USB connectivity to my University project which currently has just S/PDIF.

I know the Tenor TE7022 IC includes an S/PDIF output but don't know if it comes out onto one of the pins on the module header? Also I will need to know what power supply requirements it has.

It should still be far easier to implement than the bare TE7022 IC which would need a PCB layout and difficult soldering (the rest of the project is on prototyping boards).

Any insight much appreciated!
  Reply With Quote
Old 23rd February 2013, 07:25 PM   #202
iSP is offline iSP
diyAudio Member
 
Join Date: Jan 2013
Hi

I just assembled a kit with a friend of mine who is used to soldering PCBs (I'm not).
We used some different caps in the power-supply and changed the SMD resistors to two normal ones (we lost a resistor during unpacking...), of course these resistors are not shortcutting anything.

When powering the board, the LEDs at the powersupply part of the board and the one near the crystal (the power indicator) light up just fine. But.... the board generates a medium pitched (at about 200Hz I guess) tone. When powering off the board, it generates a way higher frequency spike for about half a second.

Our setup:

- 2x 9V amplimo transformer
- 2x 15V amplimo transformer, in serial mode, so -15, 0 +15.

Also this sound is also being produced while having the opamps unplugged. The other channel seems to be silent (which is fine), although we haven't tested it with real input yet since I don't feel comfortable having a malfunctioning (oscillating) PCB running....

How can we debug this?
  Reply With Quote
Old 24th February 2013, 07:24 AM   #203
batalok is offline batalok
diyAudio Member
 
Join Date: May 2010
Default opa627

Hi

I have the dac7. I have used opa275, lme49720ha, opa727, ad825. All dual versions (like it should). I have not try the opa627. But of these opamps the ad825 surpasses them by numbers!
Equipment: DK Signature, Denon mod + dac7, Nirvana sx, Master Contempory C speakers.
Regards
batalok
  Reply With Quote
Old 27th February 2013, 01:39 PM   #204
philps170t is offline philps170t  Singapore
diyAudio Member
 
Join Date: Dec 2012
Opa627 arrived. Nothing exciting. Maybe i got a fake. Oh well..
  Reply With Quote
Old 27th February 2013, 10:02 PM   #205
Dr_EM is offline Dr_EM  United Kingdom
diyAudio Member
 
Dr_EM's Avatar
 
Join Date: Oct 2006
Location: Swindon
Tenor module ordered, hoping I can figure out the header by tracing the PCB back and looking at the, admittedly basic, TE7022 datasheet if nothing else!
  Reply With Quote
Old 28th February 2013, 03:49 AM   #206
philps170t is offline philps170t  Singapore
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by linuxworks View Post
yes, they set the dac hardware filter flags, relating to samplerate range.

2 since one is for each dac chip.

there should have been more switches. anti-clip, for one. pin26 is left floating or grounded and I prefer to have the 2db anti-clip feature on, so that means lifting or never soldering down pin26 of the 8741 chip.
Hi,
what is anti-clip feature of the 8741 means? (sorry I asked, I am not into electronics)

Recently, I fixed up the DAC7 (by Weiliang), hooked it up to my CD player via Optical. It works fine, but sometimes there is an annoying sharp "crackling" sound (lasted 1 sec the most) whenever I skipped tracks during CD playback.
Could this anit-clipping feature help to solve this?

Regards
Phil.
  Reply With Quote
Old 28th February 2013, 04:09 AM   #207
linuxworks is offline linuxworks  United States
diyAudio Member
 
linuxworks's Avatar
 
Join Date: Jul 2008
Location: Santa Clara, CA
sounds like the cd player is not muting between tracks.

anti-clip won't help with that.

dacs can also detect various spdif conditions and mute themselves. some do it better than others.
__________________
My Photostream:http://www.flickr.com/photos/linux-works/
  Reply With Quote
Old 28th February 2013, 04:35 AM   #208
philps170t is offline philps170t  Singapore
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by linuxworks View Post
sounds like the cd player is not muting between tracks.

anti-clip won't help with that.

dacs can also detect various spdif conditions and mute themselves. some do it better than others.
If that is not the cure...Oh no...!!
  Reply With Quote
Old 28th February 2013, 04:30 PM   #209
philps170t is offline philps170t  Singapore
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by linuxworks View Post
sounds like the cd player is not muting between tracks.

anti-clip won't help with that.

dacs can also detect various spdif conditions and mute themselves. some do it better than others.
I did more test run and found that the crackling noise does not happens all the time, there is a mute feature at pin 25 on the WM8741 perhaps I can think of something for that.
  Reply With Quote
Old 2nd March 2013, 09:17 AM   #210
gugi100 is offline gugi100  Netherlands
diyAudio Member
 
Join Date: Jun 2004
Location: IJsselstein
Quote:
Originally Posted by linuxworks View Post
yes, they set the dac hardware filter flags, relating to samplerate range.

2 since one is for each dac chip.

there should have been more switches. anti-clip, for one. pin26 is left floating or grounded and I prefer to have the 2db anti-clip feature on, so that means lifting or never soldering down pin26 of the 8741 chip.
I am about to solder the WM8741. I am a bit confused about this item. The datasheet states for pin 26:
De-emphasis Control
0 = normal operation
1 = de-emphasis applied
Z = anti-clipping digital filter mode
Now if i leave pin 26 simply unconnected goes it into Z mode? Or do I need to connect pin 26 with pin 21 Zflag zero flag output?

link datasheet wm8741

Gr GJ

Last edited by gugi100; 2nd March 2013 at 09:20 AM.
  Reply With Quote

Reply


WEILIANG DAC5 - WM8741 & Tenor TE7022Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Info on Tenor TE7022? chaparK Digital Source 23 1st January 2016 01:46 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 06:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki