ES9023 / WM8804 S/PDIF DAC Group Buy - Page 42 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 27th August 2012, 07:09 PM   #411
diyAudio Member
 
Join Date: Nov 2006
Location: Lyon
Quote:
Originally Posted by jean-paul View Post
I am glad the 4.7 F tantalium cap worked out well. I guess it should be changed in the BOM and in the schematic. So to all readers: change C8 to 4.7 F tantalium as it will do better work than the original part.
Hi Jean Paul
Will a 16v do the trick ?
BTW it's a polarised part even if it's a 1210 SMD device.
Could you point it's right connexion in the Build Guide ?
Regards

Phil
  Reply With Quote
Old 27th August 2012, 07:12 PM   #412
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Hi Phil, of course it is polarized and you have a good point as tantalium caps severely dislike being reverse connected. Exactly: boom ! I already informed Subbu if the documents can be changed. The + of the cap should be connected to bead L3. Please carefully check all tantalium caps while placing them as most of them have their + marked opposed to the more standard - marking on standard electrolytic caps.....

A 4.7 F 10 V or 16 V tantalium cap is the one you would like to use. For instance the same one as the other 4.7 F tantalium caps already used on the DAC board. Why oh why is this spelling checker complaining every time I write tantalium or aluminium changing them to tantalum and aluminum ?
__________________
It's only audio. Official member of the Norske Brillegeit Gang.

Last edited by jean-paul; 27th August 2012 at 07:41 PM.
  Reply With Quote
Old 27th August 2012, 08:06 PM   #413
VT67 is offline VT67  Belgium
diyAudio Member
 
VT67's Avatar
 
Join Date: Jun 2004
Location: Belgium
Quote:
Originally Posted by jean-paul View Post
Why oh why is this spelling checker complaining every time I write tantalium or aluminium changing them to tantalum and aluminum ?
Because that's the correct spelling.

Regards
  Reply With Quote
Old 27th August 2012, 08:10 PM   #414
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Not in the periodical system which I consider to be leading ?! Aha just checked : both aluminium and aluminum are mentioned being one and the same but "tantalium" is apparently only used in Europe. Strange thing is that most end with "ium" so with "i". Niobium, iridium etc. Mysterious.

Let's say that both tantalium and tantalum 4.7 F SMD caps can be used for C8. Both will do better work at that spot. You can build the DAC in an aluminium case but an aluminum case will do just as well with a slight preference for aluminium as it has slightly better properties
__________________
It's only audio. Official member of the Norske Brillegeit Gang.

Last edited by jean-paul; 27th August 2012 at 08:21 PM.
  Reply With Quote
Old 27th August 2012, 08:52 PM   #415
diyAudio Member
 
Join Date: Nov 2006
Location: Lyon
Quote:
Originally Posted by jean-paul View Post
A 4.7 F 10 V or 16 V tantalium cap is the one you would like to use.
For instance the same one as the other 4.7 F tantalium caps already used on the DAC board.
Thank you Jean Paul for confirmation : C8+ connected to bead L3.
However, I can't find were you've noticed another 4.7uF tantalium...
  Reply With Quote
Old 27th August 2012, 09:05 PM   #416
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
As recommended earlier after having one DAC with an oscillating reg: all 4 x 4.7 F caps after the regs should be tantalium/tantalum caps as the regs dislike 4.7 F ceramic caps because of too low ESR ...

Data sheet of MIC5205 is clear about this too. I actually used tantalium/tantalum caps there in nearly all my assembled DACs but tried ceramic 4.7 F caps once on a rev. 2 board and it was not OK. As another solution I suggested to swap the 1 F at the input and the 4.7 F at the output to the other way around so 1 F at the output and the ceramic 4.7 F at the inputs but it would be best to use tants at the outputs.

Yes progress has some sharp edges. I wish we can change BOM/schematic/build guide so things will be clear again.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.

Last edited by jean-paul; 27th August 2012 at 09:14 PM.
  Reply With Quote
Old 27th August 2012, 10:03 PM   #417
diyAudio Member
 
Join Date: Nov 2006
Location: Lyon
So the parts concerned by Tantalum replacement are :
1 - C19, C22, C26, C29 and C8 for SE
2 - C19, C22, C26 and C8 for BAL
Would this one be a good candidate : http://fr.mouser.com/ProductDetail/V...U2mVu6qTaAc%3d
Please Jean Paul confirm...

Phil

PS : Yes, changes in BOM, schematic and build guide are welcome as those parts are polarized.

Last edited by korben69; 27th August 2012 at 10:30 PM.
  Reply With Quote
Old 27th August 2012, 10:21 PM   #418
VT67 is offline VT67  Belgium
diyAudio Member
 
VT67's Avatar
 
Join Date: Jun 2004
Location: Belgium
Or this one:
TAJB475K010RNJ AVX | Mouser

Regards
  Reply With Quote
Old 27th August 2012, 10:33 PM   #419
diyAudio Member
 
Join Date: Nov 2006
Location: Lyon
Hi VT67, yes it could fit too
The Vishay ref shows a 5 Ohms ESR at Mouser's, and 3.5 Ohms on the datasheet.
This value is mentionned in the MIC5205 datasheet :
"...The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above 1MHz..."
Thank you for your input !

Phil

Last edited by korben69; 27th August 2012 at 10:39 PM.
  Reply With Quote
Old 27th August 2012, 10:36 PM   #420
kynsi is offline kynsi  Netherlands
diyAudio Member
 
Join Date: May 2005
Location: cookietown
I used these from Farnell:

TPSB475K016R0800

edit: these have too high ESR.. I should replace them I guess.
edit2: ah, ESR is in mOhms so not 800 Ohms, but 0,8 Ohms. I should be ok.

DAC is sounding great!

Last edited by kynsi; 27th August 2012 at 10:45 PM.
  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
Ian asynchronous I2S and S/PDIF FIFO KIT group buy iancanada Group Buys 1738 18th December 2014 08:41 AM
Bragi, WM8804/ES9023 DAC Neutrality Digital Line Level 9 22nd September 2012 12:10 PM
FS TP NEW S/PDIF (WM8804) Receiver Module (Assembled and Tested) merlin el mago Swap Meet 3 20th October 2011 09:13 PM
Twisted Pear S/PDIF WM8804 Transceiver Module on TDA1541A problem dvb projekt Digital Source 17 21st May 2011 10:24 PM
FS: Twisted pear audio Dual COD DAC and WM8804 S/PDIF free2dev Swap Meet 4 24th July 2010 01:43 AM


New To Site? Need Help?

All times are GMT. The time now is 08:38 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