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.

ES9038Q2M Board
ES9038Q2M 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 13th January 2020, 06:42 PM   #5351
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
The thing about either a film cap or an electrolytic was an experiment. ESS recommended an electrolytic, and AKM uses standard electrolytic cap filtering for AK4499 in a partially similar way. After some more thinking about it, it may fine or possibly preferred to use a standard electrolytic, not even a higher performance one. Eventually, I want to do some experimenting with AK4499 to see if the particular type of electrolytic cap affects the sound audibly.

The ESS AVCC circuit and capacitor recommendation info is in a document available on the ESS website downloads page:
http://www.esstech.com/files/4514/40...PCB_Layout.pdf
ESS Technology :: Downloads
(I would not use DVCC as a reference voltage source, however.)

If mono mode, only one AVCC supply per dac should be enough. The purpose of having two AVCC supplies is to improve stereo imaging.

Last edited by Markw4; 13th January 2020 at 06:47 PM.
  Reply With Quote
Old 13th January 2020, 06:44 PM   #5352
Tfive is offline Tfive  Germany
diyAudio Member
 
Tfive's Avatar
 
Join Date: Jun 2018
Location: Straubing
So, to be 100% sure I understand correctly, it's the ONLY cap on the AVCC pin, right?
__________________
Want more of the good stuff? -> https://t-5.eu/
  Reply With Quote
Old 13th January 2020, 06:48 PM   #5353
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
One cap per opamp output, which should be as close to the AVCC pins as possible (as per the ESS document, if the one reads it all very carefully).
  Reply With Quote
Old 13th January 2020, 09:43 PM   #5354
babolcs is offline babolcs  Hungary
diyAudio Member
 
Join Date: Dec 2011
My experience was that a better CAP had better voice too.
(much earlier I tried several CAPs with the q2m version - OPA based ref.)

(Currently I'm playing with the PRO version of the board and uses LME49600 headphone amp for AVCC. (it is capable to feed any capacitive load))
- I tried 47uF Elna Silmic II + 22uF x7r
- and also tried 1000uF Elna Silmix II + 22uF x7r.

For me the 2nd version was better - stronger bass, somehow clearer voice in general.

I also wanted to remove the x7r - to see if there is any effect. (my former experience was that it coloured the treble on the OPAMP VCC/VEE line) - but not yet tried here.

Last edited by babolcs; 13th January 2020 at 09:49 PM.
  Reply With Quote
Old 13th January 2020, 09:47 PM   #5355
babolcs is offline babolcs  Hungary
diyAudio Member
 
Join Date: Dec 2011
Mark - question:
before Christmas my q2m gave up.

I was just listening music and suddenly it was muted.
Now the LED is continuously on (which shows that there is any input signal)
And strange, but the same happened at the same time with my SRC4392 board too. (same symptom, both LEDs are on continuously.)
Any guess what could be the problem?
The SRC4392 would be more important....
Thanks
  Reply With Quote
Old 13th January 2020, 09:57 PM   #5356
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by babolcs View Post
...the same happened at the same time with my SRC4392 board too...
Which SRC4392 board do you have?

If both boards went out at the same time it could have been a power line transient that damaged something.

Have you measured all the DC voltages, input to the boards, and output of each of the 3.3v regulators on the boards?

If something damaged, could be the MCU, could be the dac chip, AK4137 chip or some mix of the foregoing.
  Reply With Quote
Old 13th January 2020, 10:01 PM   #5357
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by babolcs View Post

...the 2nd version was better - stronger bass, somehow clearer voice in general.
Could be the AVCC regulator needed more caps on its own power supply. Could also be that it was not located close enough to the dac chip, not on the same ground plane, some other problem, or maybe a combination of problems.
  Reply With Quote
Old 14th January 2020, 08:41 PM   #5358
babolcs is offline babolcs  Hungary
diyAudio Member
 
Join Date: Dec 2011
Quote:
Originally Posted by babolcs View Post
My experience was that a better CAP had better voice too.
(much earlier I tried several CAPs with the q2m version - OPA based ref.)

(Currently I'm playing with the PRO version of the board and uses LME49600 headphone amp for AVCC. (it is capable to feed any capacitive load))
- I tried 47uF Elna Silmic II + 22uF x7r
- and also tried 1000uF Elna Silmix II + 22uF x7r.

For me the 2nd version was better - stronger bass, somehow clearer voice in general.

I also wanted to remove the x7r - to see if there is any effect. (my former experience was that it coloured the treble on the OPAMP VCC/VEE line) - but not yet tried here.

Hi Guys again,

I realised meanwhile that the x7r was not in originally.

So I added, but quite quickly I removed again.

I would like to emphasize that listening test are always subjective.
For me it seems again that the x7r colored the sound. The trebble were more bright a little bit but on the other side the sound became how to say flickering / greasy / dirty (sorry I dont know the exact english word for that)
  Reply With Quote
Old 15th January 2020, 04:20 AM   #5359
Terry Demol is offline Terry Demol  Australia
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally Posted by babolcs View Post
Hi Guys again,

I realised meanwhile that the x7r was not in originally.

So I added, but quite quickly I removed again.

I would like to emphasize that listening test are always subjective.
For me it seems again that the x7r colored the sound. The trebble were more bright a little bit but on the other side the sound became how to say flickering / greasy / dirty (sorry I dont know the exact english word for that)
I recommended using Silmic II without MLCC a long time ago. There was a
good reason for this. If you really need to bypass, try a/ PML film or b/ Al
Polymer Both have very good HF performance.

TCD
  Reply With Quote
Old 15th January 2020, 09:43 AM   #5360
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
Default Avcc advice for beginner

I am going to attempt the AVCC psu. I have a 49720 here to try aswell as opa1612

I have studied Slims schematic and also a very neat hand drawn on graph paper image that I saved from this thread.

I have some questions please.

I understand that pins 3 and 5 of the opamp are fed from a 3v3 source . I will probably use lt1963 for this for now

Pins 1+2 and 6+7 are shorted.

Pins 4+8 for 15v+-

Where does Vref actually connect to.? I understand that the 2 avcc feeds would go to the equivalent of the original AVCC cap + pads.

Thanks for your patience
  Reply With Quote

Reply


ES9038Q2M 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
My Cambridge 500SE, needs an output board (to replace internal DAC Board) slbender Digital Source 1 11th July 2018 02:43 AM
JLSounds XMOS USB board + AK4396 board + Direct DSD PCB ravid Swap Meet 1 29th December 2016 11:36 AM
Unknown Board DC12V TPA3116 amplifier board DIY L163-9 AUS Ben Class D 0 8th December 2016 04:05 AM
FS: Ian FIFO i2s-to-PCM board, Single XO clock board trung224 Swap Meet 3 26th November 2016 02:18 PM
Lost 1 Zv4 ckt board..looking to buy 1 circuit board Blues Pass Labs 1 22nd March 2004 10:09 PM


New To Site? Need Help?

All times are GMT. The time now is 05:17 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki