DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 107 - 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 10th January 2012, 09:11 PM   #1061
50AE is offline 50AE  Bulgaria
diyAudio Member
 
Join Date: Jul 2011
Location: Sofia, Bulgaria
Sorry for the double post, can't edit the old one.

I have a question about this DAC - When no music is playing, with headphones I can hear a veryyy silent repeating, irregular rhythm noise - trrr trrrrr trr trrttt trrr trrrrr trr trrtttt. It's so silent that it can be barely heard with headphones, but I'm wandering what could be the reason?

Sometimes there is another noise which appears when someone has used the USB to charge a device (mp3 player). It is more audible, but it disappears when I restart the DAC.
  Reply With Quote
Old 10th January 2012, 10:50 PM   #1062
diyAudio Member
 
Join Date: Mar 2005
Location: The Hague, the Netherlands
Interesting thread to follow, quite a read!

I noticed in the ak4396 datasheet it has a 'digital attenuator', but I can't find anything on it in this thread. Any particular reason? Not possible in combination with the ebay-board? No need? Or just the old 'digital volume control?', no way!

-Mike
  Reply With Quote
Old 10th January 2012, 11:15 PM   #1063
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by 50AE View Post
just tried replacing the V regulators with the ones recommended from the BOM. The sound is kind of "drier" now and lost its dynamics a bit, but I hope it gets better afetr burn in.
Strange... are you sure you used ON Semi MC78xx/79xx?

They should sound fuller and tighter than ST ones.
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 10th January 2012, 11:24 PM   #1064
50AE is offline 50AE  Bulgaria
diyAudio Member
 
Join Date: Jul 2011
Location: Sofia, Bulgaria
I think the dryness was apparent the first minutes of playback. Now after 2 hours everything is smooth and very dynamic, I like the sound better. I bought the regulators from farnell, each came with a nice black cardboard box like for a wedding ring.
  Reply With Quote
Old 15th January 2012, 01:20 AM   #1065
diyAudio Member
 
ggetzoff's Avatar
 
Join Date: Nov 2004
Location: Southwest
Just ordered the 4396 kit from fleabay. How much current does the board draw?
__________________
Airline Pilot-If it's not Boeing I'm not going.
"Brain as big as a planet..." {sic} Nelson Pass

Last edited by ggetzoff; 15th January 2012 at 01:23 AM.
  Reply With Quote
Old 15th January 2012, 03:05 AM   #1066
syklab is offline syklab  Hong Kong
diyAudio Member
 
Join Date: Jul 2009
Location: Hong Kong
Hi, can someone direct me to the BOM?

Thanks
  Reply With Quote
Old 15th January 2012, 03:38 AM   #1067
diyAudio Member
 
ggetzoff's Avatar
 
Join Date: Nov 2004
Location: Southwest
Default Clave's BOM

Here it is....
Attached Files
File Type: pdf MINI2496 BOM.pdf (11.6 KB, 189 views)
__________________
Airline Pilot-If it's not Boeing I'm not going.
"Brain as big as a planet..." {sic} Nelson Pass
  Reply With Quote
Old 15th January 2012, 08:18 PM   #1068
fulvio is offline fulvio  Italy
diyAudio Member
 
Join Date: Jun 2006
Location: Trieste, Italy
Hi, can anybody address me to a reliable ebay seller for Cerafine and/or Silmic?

Second question: almost all high-end voltage regulators I've seen are single voltage type; but, in my opinion, op-amp should work better when powered with a dual tracking supply (less problems with common mode voltages caused by static or dynamic supply unbalance).
I'm planning to power the op-amp of the AK4396 board with a dual tracking Toshiba M5230 (output impedance less than 0.1 ohm up to 100 KHz, noise typ. 12 uVrms from 20 Hz to 100 KHz) with a separate supply (filtered with a C-multiplier) for analog +3.3V and +5V.
What do you think about?
  Reply With Quote
Old 15th January 2012, 08:56 PM   #1069
diyAudio Member
 
ggetzoff's Avatar
 
Join Date: Nov 2004
Location: Southwest
Quote:
Originally Posted by fulvio View Post
Hi, can anybody address me to a reliable ebay seller for Cerafine and/or Silmic?

Second question: almost all high-end voltage regulators I've seen are single voltage type; but, in my opinion, op-amp should work better when powered with a dual tracking supply (less problems with common mode voltages caused by static or dynamic supply unbalance).
I'm planning to power the op-amp of the AK4396 board with a dual tracking Toshiba M5230 (output impedance less than 0.1 ohm up to 100 KHz, noise typ. 12 uVrms from 20 Hz to 100 KHz) with a separate supply (filtered with a C-multiplier) for analog +3.3V and +5V.
What do you think about?
I wouldn't buy any surface mounts from Ebay dealers. I've done it in the past and been sorry. There is real product on Ebay, the problem is you don't know who is honest and who isnt. Parts-Connexion has Silmics, and there has to be someone in Italy that sells them.
__________________
Airline Pilot-If it's not Boeing I'm not going.
"Brain as big as a planet..." {sic} Nelson Pass

Last edited by ggetzoff; 15th January 2012 at 08:57 PM. Reason: content
  Reply With Quote
Old 15th January 2012, 09:28 PM   #1070
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
Quote:
Originally Posted by michielbeijer View Post
Interesting thread to follow, quite a read!

I noticed in the ak4396 datasheet it has a 'digital attenuator', but I can't find anything on it in this thread. Any particular reason? Not possible in combination with the ebay-board? No need? Or just the old 'digital volume control?', no way!

-Mike
Good point. If this really means "digitally controlled analogue attenuator", this is something for investigating seriously. If so, I don't think it is applicable for ebay kit. It would be a good subject of new dac project.

EDIT:

Page 23 states that attenuation is done via "digitally" front of dac which means it is not such thing like "digitally controlled analogue attenuator".

Last edited by terranigma; 15th January 2012 at 09:45 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
AK4393 burn... CIMONE Digital Line Level 5 24th June 2011 03:12 PM
AK4393 to CS4223? CIMONE Digital Line Level 0 13th December 2009 03:30 PM
AK4393 Serial Configuration Problem Aoxomox Digital Line Level 0 20th March 2009 06:25 PM
AK4393, CS8413 and CS8414 Data Sheets Blue_Max Digital Source 0 23rd December 2004 02:37 PM


New To Site? Need Help?

All times are GMT. The time now is 12:35 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