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Did anyone try one of these ES9028/ES9038 DAC kits?
Did anyone try one of these ES9028/ES9038 DAC kits?
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Old 1st July 2018, 06:52 PM   #21
maartn is offline maartn  Netherlands
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Default Did anyone try one of these ES9028/ES9038 DAC kits?

Are there any regulator modules that you would recommend for feeding the ES9038PRO AVCC (and why :-))?
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Old 16th September 2018, 06:46 PM   #22
maartn is offline maartn  Netherlands
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I hooked it all up for the first time: (temp) power supplies, DAC and I2S connection from HifiBerry Digit+ Pro. Canít really judge the sound yet; couldnít connect it to my proper set yet. When the Silent Switchers arrive next week, Iíll hook those up and give it another go. IMG_2754.JPG
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Old 24th September 2018, 10:29 AM   #23
GreatLaBroski is offline GreatLaBroski
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Did anyone try one of these ES9028/ES9038 DAC kits?
I’m interested in this kit and am anticipating your impressions.
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Old 30th September 2018, 11:38 AM   #24
maartn is offline maartn  Netherlands
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Version 0.1 of this DAC build is ready! It features:
- power (+/- 15V and 3.3V) supplied by the new variable SilentSwitcher, in turn fed by a transformer and PSU, that I recycled from a previous project
- the 9038PRO DAC board
- digital signal supplied by I2S from a HifiBerry Digi+Pro on top of a Raspberry Pi 3B
- separate L/R volume controls
- balanced outputs

I've been listening to it for about a week now. My impression is very positive: the sound has a lot of detail and clarity, with a wide sound stage. Also there is almost no pops/clicks at start-up and shutdown and no noise at all when changing tracks - which was my main annoyance with my previous set-up (Beresford TC-7520SE Caiman, using SPDIF output from the Digi+). I do have to get used to the difference in frequency response. Apparently the Beresford had a very "warm" sound, with more bass, whereas the high level of detail in the higher tones make the 9038 sound more "trebly".
I intend to get a proper oscilloscope soon and publish some measurements on the unit.
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Last edited by maartn; 30th September 2018 at 11:41 AM.
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Old 30th September 2018, 12:02 PM   #25
Markw4 is offline Markw4  United States
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"Trebly," with these, ESS Sabre dacs usually means too much harmonic distortion, and perhaps not good enough AVCC regulation at low frequencies. Both are fixable, but it can be a lot of work.
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Old 14th October 2018, 07:40 PM   #26
maartn is offline maartn  Netherlands
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I now equipped each of the 3.3V inputs with its own LT3045 regulator module. See attached pics. Of course it is subjective but to me the sound has really improved. Frequency response of low frequencies is very good now; the balance between low and high is right. And the sound stage is even wider and more detailed. I really like the sound of this DAC! I am hearing things in my good old song collection that I never heard before.

Oscilloscope is supposed to arrive coming week. Let's see if the measurements are as good as the sound...
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File Type: jpg s-l1600.jpg (82.0 KB, 583 views)
File Type: jpg IMG_2798.jpg (695.0 KB, 561 views)
File Type: jpg IMG_2797.jpg (766.3 KB, 546 views)
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Old 14th October 2018, 08:41 PM   #27
Markw4 is offline Markw4  United States
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Good to read that the sound quality is getting better. How about the clock on that dac?
Many people find another leap upward in terms of improved sound quality with an ultra-low phase noise clock if the dac doesn't already have one. Crystek 575 is a good and popular choice if looking for 100MHz.

Also, if using LT3045 for AVCC 3.3v power, Cset should be increased to the maximum recommended 22uf. Data sheet has info on recommended dielectric type.

Last edited by Markw4; 14th October 2018 at 08:44 PM.
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Old 15th October 2018, 12:08 AM   #28
Hugh Jazz is offline Hugh Jazz  Taiwan
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Quote:
Originally Posted by maartn View Post
I now equipped each of the 3.3V inputs with its own LT3045 regulator module. See attached pics. Of course it is subjective but to me the sound has really improved. Frequency response of low frequencies is very good now; the balance between low and high is right. And the sound stage is even wider and more detailed. I really like the sound of this DAC! I am hearing things in my good old song collection that I never heard before.

Oscilloscope is supposed to arrive coming week. Let's see if the measurements are as good as the sound...
Just to confirm - each of the four is AVCC_L, AVCC_R, VCCA and DVCC?

I'm currently playing around with a 9018k2m - it's very small so due to space constraints I'm trying to see if I can use 3 regs - first one for both AVCC L & R (some loss of stereo separation is expected), second for VCCA and DVCC (no audible effect from sharing via separate ferrite beads/caps? they have some PSRR so I hope not), and third for the 100MHZ xo.

Looking forward to your scope results :-)

Last edited by Hugh Jazz; 15th October 2018 at 12:17 AM.
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Old 15th October 2018, 03:05 PM   #29
sq225917 is offline sq225917  United Kingdom
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Send a message via MSN to sq225917 Did anyone try one of these ES9028/ES9038 DAC kits?
Maartn, how are those regs I was eyeing them up last week they look good value at six bucks.
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Old 16th October 2018, 06:49 PM   #30
maartn is offline maartn  Netherlands
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Quote:
Originally Posted by Markw4 View Post
Crystek 575 is a good and popular choice if looking for 100MHz.
Thanks for the suggestion! I have put it on my list.

Quote:
Originally Posted by Markw4 View Post
Cset should be increased to the maximum recommended 22uf.
Could you explain why that is? My secondary goal with this project is to learn more about electrical engineering...
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