Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 132 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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 23rd October 2012, 02:19 AM   #1311
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by iancanada View Post
All passive battery manage board PCB posted today for evaluation. Hope testing group will get them soon.

bigpandahk: Just sent a new isolator PCB together, four resistor arrays assembled. Hope it works.

Ian
Ian

You are GREAT. THANKS VERY MUCH.

I am still trying hard to assemble the resistor arrays correctly.
  Reply With Quote
Old 23rd October 2012, 07:24 AM   #1312
diyAudio Member
 
Join Date: Jul 2009
Followed Ian's procedures and with the help of microscope, I finally soldered the resistor arrays without any short. The isolator board is working now and sound GREAT.

With the board, I can clearly hear a much better bass. Will report again after run-in.
Attached Images
File Type: jpg IMG_0745.jpg (437.7 KB, 394 views)
File Type: jpg IMG_0744.jpg (586.1 KB, 391 views)
File Type: jpg snap.jpg (226.9 KB, 378 views)
  Reply With Quote
Old 23rd October 2012, 07:45 AM   #1313
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
Great news! Look forward to hearing more reports on how these go
  Reply With Quote
Old 23rd October 2012, 07:46 AM   #1314
hirez69 is offline hirez69  Europe
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by iancanada View Post
hirez69:

The max input DC is rated at 5.5V. Could go a bit higher based on real testing, because of output current is much lower then 200ma for each LDO. But not recommend higher than 6.5V

Ian
Thank you.
I own a 6.6V LiFePO4 battery, but I think it's better not to use it.
  Reply With Quote
Old 23rd October 2012, 08:36 AM   #1315
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by hirez69 View Post
Thank you.
I own a 6.6V LiFePO4 battery, but I think it's better not to use it.
I am also using LiFEPO4 battery without any problem with both clock and FIFO. 6.6V is only when the battery is fully charged and will drop below 6.5V in very short time.
  Reply With Quote
Old 23rd October 2012, 09:53 PM   #1316
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Quote:
Originally Posted by bigpandahk View Post
Followed Ian's procedures and with the help of microscope, I finally soldered the resistor arrays without any short. The isolator board is working now and sound GREAT.

With the board, I can clearly hear a much better bass. Will report again after run-in.
As I said you can make it. Did your hand survive from the hot air .

I like the isolator board, it makes the grounding design much easier for a DAC to get rid of ground loop. The clock should always be treated as an analog part for a DAC. The isolator board makes them together.

Ian
__________________
Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
  Reply With Quote
Old 23rd October 2012, 10:50 PM   #1317
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by bigpandahk View Post
I am also using LiFEPO4 battery without any problem with both clock and FIFO. 6.6V is only when the battery is fully charged and will drop below 6.5V in very short time.
no thats incorrect, at least for any legit A123 ive had/have, 3v3 is the nominal LiFePO4 chemistry voltage; fully charged is up to 3v65 so 2 in series like you have is 7.3V!! then they usually drop to around 3v45 (6v9) pretty quickly and spend about 80% or more of their time slowly going down to 3v25 per cell and then drop pretty quickly to 2v9-3v. the vast majority is of that is spent well ABOVE 3v3/6v6
  Reply With Quote
Old 23rd October 2012, 10:59 PM   #1318
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by iancanada View Post
As I said you can make it. Did your hand survive from the hot air .

I like the isolator board, it makes the grounding design much easier for a DAC to get rid of ground loop. The clock should always be treated as an analog part for a DAC. The isolator board makes them together.

Ian
Yes, the board is a great design, I will use the additional isolator for I2C and see if there is any further improvement.
  Reply With Quote
Old 23rd October 2012, 11:27 PM   #1319
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Quote:
Originally Posted by bigpandahk View Post
Yes, the board is a great design, I will use the additional isolator for I2C and see if there is any further improvement.
Yes, you should. You may try to place the I2C isolator at the empty space. You can source it from digikey.

Ian
__________________
Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
  Reply With Quote
Old 24th October 2012, 01:00 AM   #1320
diyAudio Member
 
Join Date: Jul 2009
Quote:
Originally Posted by qusp View Post
no thats incorrect, at least for any legit A123 ive had/have, 3v3 is the nominal LiFePO4 chemistry voltage; fully charged is up to 3v65 so 2 in series like you have is 7.3V!! then they usually drop to around 3v45 (6v9) pretty quickly and spend about 80% or more of their time slowly going down to 3v25 per cell and then drop pretty quickly to 2v9-3v. the vast majority is of that is spent well ABOVE 3v3/6v6
I am using China made "LiFEPO4", can't proof if it is real "LiFePO4" fully charged voltage is 7.2V, 3.4 is the highest voltage removed from charger and drop quickly below 3.3. Two battery can power the clock + FIFO + SPDIF for more than 18 hours.
  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
XMOS-based Asynchronous USB to I2S interface Lorien Digital Source 2128 Yesterday 05:05 PM
exaU2I - Multi-Channel Asynchronous USB to I2S Interface exa065 exaDevices 1357 3rd March 2014 08:51 PM
DAC chip selection + I2S jitter questions drwho9437 Digital Line Level 2 26th July 2010 12:50 PM
Simple FIFO to I2S CPLD, for MCU players / reclocking KOON3876 Digital Line Level 21 19th September 2008 04:00 PM
asynchronous reclocking and low jitter clocks ash_dac Digital Source 3 8th February 2005 09:22 AM


New To Site? Need Help?

All times are GMT. The time now is 11:00 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