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ES9038Q2M Board
ES9038Q2M Board
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Old Today, 11:43 AM   #1971
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
In my opinion these boards when new are unlistenable, so you still haven't made me sure its broken, although it could be.
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Old Today, 12:05 PM   #1972
paulmarinis is offline paulmarinis  Greece
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Join Date: Sep 2007
Hi all.
I dont write much in this forum, but i read alot
I got this board about a month ago (version 1.07), and did some basic upgrades (dual dc power supply for the board, low noise power supply for the amanero which made a difference in audio)
Could you please advise the next steps?
from what i understand modifying the board to current state is the way to go.
also changing the clock?
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File Type: jpg _20180716_144905 (1).JPG (776.8 KB, 25 views)
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Old Today, 01:45 PM   #1973
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Join Date: May 2018
Quote:
Originally Posted by Markw4 View Post
In my opinion these boards when new are unlistenable, so you still haven't made me sure its broken, although it could be.
I'll record a small snippett of audio so you can hear what it sounds like.
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Old Today, 01:59 PM   #1974
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
To fully modify the board for best sound quality is rather involved. Can't say if anyone besides me has done everything we know how to do so far.

How about if I post some links here to prior posts that are good for taking a look at and talk about various things that can be modified? After taking a look it may be possible to get a better idea of what can be done.

Before I do that though please let me summarize the mods, they include improved power supplies including more on-board local regulators for some parts of the circuitry, a very special and very critical power supply called AVCC, new analog output circuitry including current to voltage conversion (I/V) and differential summing stages, a new clock, an external upsampling board, an Arduino microcontroller to augment digital control of the DAC chip, and a modified cheap ebay LME49600 headphone amp to clearly hear DAC sound quality performance (the 1/8" jack on the board loads down the opamp and should not be used for headphones).

Lot of stuff in that list, right?

Here is a link to some ESS documents that should all be studied: ESS Technology :: Downloads

I will attach a file below with some links to thread posts of possible modding interest.
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File Type: txt List of DAC Thread Posts.txt (2.5 KB, 6 views)

Last edited by Markw4; Today at 02:02 PM.
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Old Today, 02:09 PM   #1975
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
I will attach a picture below of the full test setup as it exists today.

If not familiar with how photos work when viewing in the forum, you can click on a photo to open it for viewing. While it is open if you hover the mouse over the lower left corner, a white X may appear which would indicate the picture is not being displayed at full size. Clicking on the white X will open the picture at full resolution.

It is also possible to right click on an opened picture and select to download it for viewing on the local computer.

EDIT: Found I forgot to include a link in the last post to pics of pin lifting the microcontroller to allow connection of the Arduino:
ES9038Q2M Board
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Last edited by Markw4; Today at 02:30 PM.
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Old Today, 02:54 PM   #1976
paulmarinis is offline paulmarinis  Greece
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Join Date: Sep 2007
hi, and thanks alot for the info.
im already reading the ESS document, but from what I understand the capacitors and resistors are already good enough.
please note that the v 1.07 already has the selection of the dac filters and the volume control from the potentiometer.
Ill read some more and come back!
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Old Today, 03:11 PM   #1977
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Join Date: May 2018
I've recorded a 40 second clip of my board playing back a VBR MP3 using my Auna CM600 condenser mic, saved as a VBR MP3 it's a 901kB file but I can't upload it here, I get the error 'invalid file type'.

So I uploaded it to Google Drive:

CCR.mp3 - Google Drive

The distortion is actually less obvious than it is when hearing it 'live' so to speak, but the lack of low frequencies, the fuzziness and the overall crappy quality should still be obvious I think.
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