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 Line Level DACs, Digital Crossovers, Equalizers, etc.

!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990
!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990
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 18th December 2016, 05:08 AM   #11
G D is offline G D  India
diyAudio Member
 
Join Date: Jul 2016
Location: Hyderabad
Phase,

Thanks for your response.

Ya i tried finding out on the internet if anybody else has had similar problems, couldn't find any.

seems like a strange issue, and am thinking the issue hopefully is with the xmos board !
  Reply With Quote
Old 18th December 2016, 06:21 AM   #12
Thorp is offline Thorp
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by G D View Post
Thorp,

Thanks for your response.

Is there a way to know this, or can one of the power supply be disabled ?
1. You can disconnect USB cable, and check V+ from main board, see attached picture
2. You can power off main board, connect USB cable, and check V USB
XMOS.jpg
  Reply With Quote
Old 18th December 2016, 06:57 AM   #13
androa76 is offline androa76  Slovenia
diyAudio Member
 
Join Date: Mar 2007
Location: Maribor
First measure if 5v comes on pin V+ if yes then further measure voltages 3.3...1.8 and 1v. You have black inductors L... measure points. If all voltages are present than take a look if shield of usb connector on dac board is dirrectly conected to gnd or trought capacitor. If directly cut trace between shield and gnd and instal 100nF smd if capacitor is present than connect shield and gnd. Then we will go on.
  Reply With Quote
Old 2nd February 2017, 07:26 AM   #14
G D is offline G D  India
diyAudio Member
 
Join Date: Jul 2016
Location: Hyderabad
Guys,

Apologies for not being able to update the results earlier.

So its goes like this...

Firstly Thanks to Phase, Thorp , Androa76.

I tried poking here and there to get the xmos to work, then with my multimeter tried measuring the 5v on V+ pins . everything seemed fine.

However this time , the xmos power stopped failing and it would come on everytime i powered the DAC.

Honestly something worked for me, thanks to you guys and its seems to be working fine ever since.

Thanks once again !
  Reply With Quote
Old 2nd February 2017, 02:10 PM   #15
Sergelisses is offline Sergelisses  France
diyAudio Member
 
Join Date: Nov 2003
Location: Near PARIS
Quote:
Originally Posted by vulejov View Post
I had few years ago XMOS_AK4399 board from same seller with same problem, end up in trash..
Every Chinese product is more or less fake.. you can buy products from real constructor with real support and real parts, not some cheap garbage from cloners without any knowledge..
Have you some links from real constructor ?
I would like to found a good dac ~ 200Ä

Serge
  Reply With Quote
Old 8th July 2017, 08:38 PM   #16
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
I have a different issue with an xmos dac; have very low output, device is recognized.
Is there a troubleshooting guide somewhere that describes typical xmos output voltage, output stage input voltage etc?


I suppose I could compare with another functional ak4495 dac I have here, but would really rather avoid poking around on a nice assembly if possible...
  Reply With Quote
Old 9th November 2017, 02:23 PM   #17
MykhailoM is offline MykhailoM  United Kingdom
diyAudio Member
 
Join Date: Mar 2012
Location: London, SW16 6BA
Hi guys,

Just recently I had a bad experience with Chinese supplier "minishow0328" I have ordered this DAC board (new Parallel AK4495 AK4495EQ X2 DAC 192K decoder AK4118 Upgrade software +XMOS USB for hifi audio-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group)
which turned up to be faulty and not working with XMOS USB module. The DAC board sounds at low volume with mono Op-Amps removed !! - a complete nonsense. XMOS USB detected by Linux and Windows bot no sound coming through. The seller is lucky I didn`t open the parcel in the first month received as I was busy with other things. When I contacted the seller, he says it`s my fault, then after exchanging several emails with video and pictures he asked to return the DAC board but NOT giving the return address even though I requested it several times. Here you have it my experience. Now I would advise to buy from DHgate (Wholesale – Buy China Wholesale Products on DHgate.com) or Manufacturers, Suppliers, Exporters & Importers from the world's largest online B2B marketplace-Alibaba.com it looks there are more serious sellers in those directories.

Last edited by MykhailoM; 9th November 2017 at 02:26 PM.
  Reply With Quote
Old 9th November 2017, 02:58 PM   #18
AIM65 is offline AIM65  France
diyAudio Member
 
Join Date: Feb 2015
Location: Paris
!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990
Itís not surprizing that the board sounds without the opamp, signal goes through input and feedback resistors as this is a low pass filter with, probably, multiple feedback topology. If it sound that means dac and interface are running. Also try with spdif and coax inputs.
Check the supply of the opamp: pin 7 and pin 4 against a reference: the outer connection of the output cinch connector, you should have +/-12 or 15V.
  Reply With Quote
Old 9th November 2017, 03:12 PM   #19
MykhailoM is offline MykhailoM  United Kingdom
diyAudio Member
 
Join Date: Mar 2012
Location: London, SW16 6BA
Hi, The SPDIF and Optical are working although no XMOS USB signal.
I have measured the Op-Amp voltage on both Mono Op-Amps
Pin 8 = 14.47V
Pin 4 = -0.30V

When I insert the mono op-amps there is no sound at all and I have tried supplied and another discrete. Something is wrong the only challenge is to find out what causes it.

Please check the attached high resolution pictures if it helps anyhow.( I will try to attach it here): Shared album - Mykhailo M - Google Photos
and
Shared album - Mykhailo M - Google Photos

Last edited by MykhailoM; 9th November 2017 at 03:16 PM.
  Reply With Quote
Old 9th November 2017, 03:14 PM   #20
MykhailoM is offline MykhailoM  United Kingdom
diyAudio Member
 
Join Date: Mar 2012
Location: London, SW16 6BA
Sorry Pin 7 = 14.47V
  Reply With Quote

Reply


!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990Hide 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
Drivers for Weiliang XMOS ES9023 Asynchronous DAC Decoder USB to Optical Coaxial 384K goodguy2007 Digital Source 1 5th June 2016 07:05 AM
XMOS ES9023 Asynchronous DAC Decoder USB to Optical Coaxial 384K 32Bit Weiliang Bgt Digital Source 15 22nd February 2016 07:15 PM
A PCM1704 DAC with Xmos USB interface hllyfm Digital Line Level 10 21st May 2015 01:02 PM
ES9018 DAC -AD79-XMOS DSD usb Bobekt Digital Source 0 17th August 2014 09:42 PM
FS: XMOS USB interface/dac ultrafi Swap Meet 2 27th May 2011 08:32 PM


New To Site? Need Help?

All times are GMT. The time now is 01:16 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki