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ES9038Q2M Board
ES9038Q2M Board
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Old 28th September 2020, 01:02 PM   #5951
Aldoszx is offline Aldoszx
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Join Date: Jan 2020
Yes, I will try to do that.
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Old 8th October 2020, 01:53 PM   #5952
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Because things are pretty slow here today, a pic below showing most of the current state of the AK4499 eval board. As can be seen, ebay power supplies work great for everything (except Vref). Easily beats Topping D90 sound. Vocals are not grainy, nor are cymbals. They sound like whatever is on the CD. The eval board itself is upside down and on the bottom. The large-ish green board on top of it is something I made to run some experiments. Some of the circuitry is on the under side. Having acquired some data, a new experimental board is in the works. The Green/Yellow/Orange ribbon cable running around is my color code for I2C bus.

Shown in the second pic is the stack of HPAs used for listening tests. There are two SOA or near-SOA units from Neurochrome, and one Pass Labs HPA-1. They all sound different. Top and bottom ones are my favorites, with the top one getting most of the use by me. When Jam comes over to listen he likes to use the Pass HPA-1, which he knows very well (being the designer of it).
Attached Images
File Type: jpg AK4499 Eval Setup-1.jpg (784.0 KB, 341 views)
File Type: jpg HPA_Stack-1.jpg (569.7 KB, 330 views)

Last edited by Markw4; 8th October 2020 at 01:58 PM.
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Old 9th October 2020, 09:05 PM   #5953
samoloko is offline samoloko  Bulgaria
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Join Date: Jun 2006
Hi Daniel,
Is black pcb an balanced out opamp output stage
can you please give details
can this be purchased online

Quote:
Originally Posted by Green77 View Post
Hi.

Just solder my PCB (not so Nice ) and i think itís working ok.
I think itís a big improvment from the orginal voltage mode anyway.

BR//Daniel
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Old 10th October 2020, 09:12 AM   #5954
Green77 is offline Green77  Sweden
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Join Date: May 2007
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Hello samoloko,

It’s a balanced output stage (rca). Built as schematic (type) as in post #3003.

Maybe i can try to uppland gerber file later.

BR // Daniel
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Old 10th October 2020, 08:17 PM   #5955
samoloko is offline samoloko  Bulgaria
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thank you
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Old 13th October 2020, 12:25 AM   #5956
24century is offline 24century
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Join Date: Sep 2012
Send a message via ICQ to 24century ES9038Q2M Board
Quote:
Originally Posted by Green77 View Post
Hi.

Just solder my PCB (not so Nice ) and i think itís working ok.
I think itís a big improvment from the orginal voltage mode anyway.

BR//Daniel

Does it has LPF for the 1st stage?
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Old 15th October 2020, 09:22 AM   #5957
Green77 is offline Green77  Sweden
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Join Date: May 2007
Location: MJOLBY
Hello,

Here is the Gerber file for the PCB i use in my dac.
It's from the schematic in post #3003, except that it doesn't have the unbalanced output.
Works for me but can't say for sure that's a correct PCB. And layout are for sure not optimized.
But a nice improvment over the voltage mode OP that are on the orginal dac pcb...

Reason for R13-R16 is throug hole (i put a SMD 1206 in parallel) is that i couldn't find smd parts.
So if anyone want to build this pcb choose either R13-R16 or R20-R23.
D1 and R19 is also an option, i use it to see that dac was on.

BR // Daniel
Attached Files
File Type: zip IV2010.zip (39.7 KB, 20 views)
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Old 16th October 2020, 02:26 PM   #5958
24century is offline 24century
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Can't really open up the zip Daniel, did you make it on a Mac?
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Old 16th October 2020, 02:42 PM   #5959
Markw4 is offline Markw4  United States
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Maybe try using 7-zip. Worked fine here.
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Old 16th October 2020, 03:29 PM   #5960
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
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Quote:
Originally Posted by Green77 View Post
...Maybe i can try to uppland gerber file later.
Daniel,
May I ask what program you used to create the gerbers? If we could look at the source files in the same program then it might be possible to make a few improvements. Hard to say for sure though. Just looking at the gerbers in a gerber viewer is pretty limited.

Last edited by Markw4; 16th October 2020 at 03:31 PM.
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