DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 75 - 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 16th October 2011, 03:12 PM   #741
jef9200 is offline jef9200  Belgium
diyAudio Member
 
Join Date: Feb 2006
Location: Belgium
Sure, i'll try without !
I'm still looking for wiring in balanced mode. Find this:XLR Pin 1 question - chassis vs circuit ground

"An important issue occurs when using transformers for balanced use as opposed to electronic differential inputs. A transformer is only connected to pins 2 and 3 even if there is a center tap. The center tap should not be connected to pin 1. When you have a single transformer either at the send or receive end it will not work if either pin 2 or 3 is open at the other end.(simon 7000).

The Xlrs pin1 are grounded on my preamp, maybe a good idee to not connect it on the dac side ? (ground loop)
  Reply With Quote
Old 16th October 2011, 04:59 PM   #742
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
No, it's not a good idea not to ground pin 1 on both sides of the connection.

That doesn't mean that the center tap has to be connected to pin 1. Follow what the transformer manufacturer specifies.

The loop is formed in unbalanced connection when you connect the same ground point twice within the same box from different places.

On an unbalanced cable with two conductors and a shield you may leave the shield unconnected on one side, but there should always be two connectors soldered or one connector and a shield soldered on both ends.
  Reply With Quote
Old 16th October 2011, 05:11 PM   #743
diyAudio Member
 
Join Date: Nov 2010
Hi Stormsonic

Du you know where I can by this PCB BNC connector ?

/Bjarne
  Reply With Quote
Old 17th October 2011, 02:40 AM   #744
i2k92 is offline i2k92  Indonesia
diyAudio Member
 
Join Date: Mar 2005
Location: Indonesia
I'm very interested to this DAC & will buy it ASAP. But before doing that, is somebody kind enough to post the schematic, layout, etc. I know that some seller will send it after the purchase, but I want to have all the info prior to the purchase (just to start to list what other components I need to order to mod this thing).

thanks in advance...
  Reply With Quote
Old 17th October 2011, 08:56 AM   #745
diyAudio Member
 
Join Date: Mar 2009
Location: Smoky Mountains, NC
See post #1 attachment
  Reply With Quote
Old 17th October 2011, 11:15 AM   #746
i2k92 is offline i2k92  Indonesia
diyAudio Member
 
Join Date: Mar 2005
Location: Indonesia
Quote:
Originally Posted by pjblakey View Post
See post #1 attachment
I' m an idiot , how can I missed that. Thanks a lot.
  Reply With Quote
Old 21st October 2011, 02:02 PM   #747
diyAudio Member
 
Join Date: Jun 2003
Location: Perth, Australia
Hello,

I have just ordered a CS8416 / AK4396 DAC kit (not assembled). While I am waiting for it to arrive, I am thinking about upgrading the 3.3V regs and using a LT1761 low noise reg at each power insertion as close to the relevant IC as possible. i.e. not use the LM117s.

LT1761 allow a maximum current draw of 100mA so I have been checking the current requirements of the receiver and DAC. The DAC is no problem. However, I am not so sure about the CS8146.

The datasheet DC electrical characteristics shows a maximum analog (VA) supply current of 9.5mA and digital (VD) of 23mA, both at at 192 kHz frame rate.

So, my question is whether I am correct in assuming that the maximum current draw is the 23mA for VD.

If so, the LT1761 will be quite comfortable. I am currently using a 3.3V LT1761 to feed an low jitter SMD XO that draws about 25mA and it runs just barely warm, provided it's V in is about 5V. With a suitable output cap, 150uF Oscon SEP for example, the output noise is less than 20uV, which is about half that of the LM117.

Joe
  Reply With Quote
Old 21st October 2011, 02:21 PM   #748
Tenson is offline Tenson  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: Kent
I wouldn't bother fiddling with the regs, the 117 is quite good enough. I've tried on similar DACs to use fancy regs and there is little to no measurable benefit on the audio outputs, although sometimes you will see a little difference in noise spectra.
  Reply With Quote
Old 21st October 2011, 02:42 PM   #749
diyAudio Member
 
Join Date: Jun 2003
Location: Perth, Australia
Thanks for your reply. You may well be right, but my recent experience with extensive upgrades to the power supply and regulators on my CD player's DAC and filter chips brought a general, albeit subtle, improvement.

I have all the parts to do the LT1761 regs and I am quite happy to invest the time and effort and to experiment.

So I am still looking for confirmation that I have read the datasheet correctly.

Joe
  Reply With Quote
Old 21st October 2011, 02:55 PM   #750
Tenson is offline Tenson  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: Kent
If you are lifting the pins on the CS8416 and AK4396 at the VD and VA points and giving a regulator to each (4 regs) then it should be no problem current draw wise.

Make sure you return the ground of the regulators to the point on the PCB used by the existing regs, not some arbitrary close ground point near the chips.
  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 02:12 PM
AK4393 to CS4223? CIMONE Digital Line Level 0 13th December 2009 02:30 PM
AK4393 Serial Configuration Problem Aoxomox Digital Line Level 0 20th March 2009 05:25 PM
AK4393, CS8413 and CS8414 Data Sheets Blue_Max Digital Source 0 23rd December 2004 01:37 PM


New To Site? Need Help?

All times are GMT. The time now is 05:08 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