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.

Moving from 9038Q2M to a 9028Pro board
Moving from 9038Q2M to a 9028Pro board
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 20th June 2018, 08:56 PM   #11
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
Is this the same board that was referenced early on in the other 9038 thread?
I wondered why no one put up a link to it when it seemed to have a lot going for it...

Those purple elnas arenít helping you, discovered that on a similar dac here recently, and if you can manage to get a COG .1uf for the clock, that will help a lot also.

Iíve been pretty happy with the lt1963 so far.
  Reply With Quote
Old 20th June 2018, 08:58 PM   #12
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
There are likely separate AVCC filter caps for each channel. Should be.
  Reply With Quote
Old 20th June 2018, 08:59 PM   #13
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
The challenge is that the first decoupling cap leading from the AVCC LT1963 then feeds to other decoupling caps closer to the DAC via an inner layer. At those points, the designers feed from there to the two AVCC resistor divider circuits via a surface trace layer on the board. So the challenge is to cut off the feed from the first cap to the other caps...inside the board.
  Reply With Quote
Old 20th June 2018, 09:00 PM   #14
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
Quote:
Originally Posted by Markw4 View Post
There are likely separate AVCC filter caps for each channel. Should be.
Yes, there is.
  Reply With Quote
Old 20th June 2018, 09:02 PM   #15
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
How about removing the resistor dividers and tossing them? Run new wires above board to the pads. ... Although, it doesn't make sense to have resistors last, should be caps last before the AVCC pins.
  Reply With Quote
Old 20th June 2018, 09:04 PM   #16
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
Quote:
Originally Posted by phase View Post
Is this the same board that was referenced early on in the other 9038 thread?
I wondered why no one put up a link to it when it seemed to have a lot going for it...

Those purple elnas aren’t helping you, discovered that on a similar dac here recently, and if you can manage to get a COG .1uf for the clock, that will help a lot also.

I’ve been pretty happy with the lt1963 so far.
Are you referencing the SilmicIIs? The burgundy ones are SilmicIIs. The lighter color ones are 33uF Sanyo oscons.

Last edited by Mikett; 20th June 2018 at 09:06 PM.
  Reply With Quote
Old 20th June 2018, 09:08 PM   #17
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
Quote:
Originally Posted by Markw4 View Post
How about removing the resistor dividers and tossing them? Run new wires above board to the pads. ... Although, it doesn't make sense to have resistors last, should be caps last before the AVCC pins.
Yeah there caps before the AVCC pins but they are connected inside the layer to the LT1963. So essentially the L&R AVCC feed branch out inside the board.
  Reply With Quote
Old 20th June 2018, 09:10 PM   #18
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Then what was that about divider resistors?
  Reply With Quote
Old 20th June 2018, 09:13 PM   #19
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
Quote:
Originally Posted by Markw4 View Post
Then what was that about divider resistors?
Right at the IV stage AVCC/2.
  Reply With Quote
Old 20th June 2018, 09:20 PM   #20
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
Divider 4.7 K - 4.7K
Attached Images
File Type: jpg AVCC divider.JPG (595.4 KB, 156 views)
  Reply With Quote

Reply


Moving from 9038Q2M to a 9028Pro boardHide 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
ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi iancanada PC Based 591 Today 12:30 AM
Moving day jackinnj The Lounge 12 26th January 2016 01:32 PM
Moving Pots from the PCB georgebrooke Construction Tips 10 15th September 2013 10:01 PM
The Hazards of Moving KBK Everything Else 1 2nd February 2004 10:44 AM


New To Site? Need Help?

All times are GMT. The time now is 09:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki