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ES9038Q2M Board
ES9038Q2M Board
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Old 14th February 2018, 01:18 AM   #211
Markw4 is offline Markw4  United States
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It looks to me like the first thing to do might be to fix AVCC+. It also looks like the ES9038Q2M is a reduced pin count package of a ES9038PRO, maybe with 4 channels rather than 8, based on the appearance and locations of pins. That being the case, one op-amp ought to be able to supply what looks to be two AVCC+ pins, instead of 4 on the PRO version. Right now AVCC+ is supplied from the 3.3V supply for the digital circuitry, using only a single pole RC filter for isolation. Great for a critical analog signal, and they saved a whole 30 cents on not having buy another regulator!

I have an idea how to implement the ESS recommended circuit, by removing a few parts and mounting a little proto board under the bottom of the DAC PCB, where there is a very nice and convenient ground plane. I'm guessing it should reduce distortion and improve PSRR at the same time.

A bit more involved mod could provide current mode outputs ala Victor. Also, thinking of mounting it on the bottom.

If lucky, the cost of parts for the mods might possibly be made up by being able to use a slightly lesser quality power supply than a Silent Switcher (which costs twice as much as the DAC board).
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Old 14th February 2018, 01:08 PM   #212
Markw4 is offline Markw4  United States
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Got around to looking at the ES9038Q2M board on a spectrum analyzer. A 1kHz test tone produces a lot of LF aliasing at 48kHz sample rate and using the default reconstruction filter. It looked virtually fixed when the ADC sample rate was upped to 96kHz. It also sounded much cleaner using some headphones, fixing a large amount of the distortion I said sounded really awful in a previous post. Guess that may have a fair bit to do with why Benchmark went with pre-DAC SRC to 210kHz.

That left primarily some 3rd, and a bit less 2nd harmonic distortion. Those would be expected from voltage mode operation.

It is still running on a Silent Switcher PS. PSRR should probably be further investigated, although it may always need very clean power. Have to see about it later, I guess.
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Old 14th February 2018, 07:03 PM   #213
Markw4 is offline Markw4  United States
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Anybody ever try one of these things with one of these DACs? miniDSP Kits : miniDIGI

May grab one and do some experiments with it do see if I can get a workable solution using the ES9038 slow transition reconstruction filter. The biggest drawback may be the shipping and handling fee which is apparently $20 for a $30 item. Ouch!
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Old 15th February 2018, 08:30 AM   #214
Adson is offline Adson
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Hello,
I'm a newbie in this matter, so, my questions, probably, are stupid. Sorry if it true.

I have the "old version" (1.04) of the board and I would like to improve power lines on it slightly. Unfortunately, there is no headroom in the selected case to place big regulators boards and I plan to:
- replace AMS1117-3.3 regulator by LT1963-3.3 in the same case
- replace 7808 regulator by something like LM1084IT-5.0

Therefore, the questions:
- is there the sense to do it? Or I need to add some patch pcb like this https://www.ebay.com/itm/TPS7A4700-L...A/172746164061
- is 5V instead of 8V sufficient? If yes, what is the best solution for 5V regulator in place (I mean in TO220-3 package)

Many thanks in advance for your opinion.
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Old 16th February 2018, 05:23 AM   #215
chermann is offline chermann  Austria
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Quote:
Originally Posted by zek View Post
Topping has several new DACs, which may be interesting.
DX7s - TOPPING
D10 - TOPPING
i tried the mytek brooklyn DAC. IT is the same chip as the Topping D10 = ES9018K" implemented. This is a chip for portable devices and the price of the D10 is top i guess.

the sound ins fine but i like more the sound aune S16. very very good price and SQ...
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Old 16th February 2018, 05:47 AM   #216
chermann is offline chermann  Austria
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Quote:
Originally Posted by TypodCrow View Post
I also found this: Hifime UDA38Pro DAC (ES9038Pro + SA9227)

Need to find measurements of these now!

1 ES9038ES ... NX4 2017 version - portable chip ES9038Q2M
NEUE Richt NX4 DSD XMOS XU208 Chip DAC ES9038Q2M Chip Tragbare USB DAC DSD Decoder Verstarker Kopfhorer AMP Verstarker in NEUE Richt NX4 DSD XMOS-XU208 Chip DAC ES9038Q2M Chip Tragbare USB DAC DSD Decoder Verstarker Kopfhorer AMP Verstarker aus Kopfhorer Verstarker auf AliExpress.com | Alibaba Group
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Old 16th February 2018, 06:38 AM   #217
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by chermann View Post
1 ES9038ES ... NX4 2017 version - portable chip ES9038Q2M ...
There is no SPDIF, only USB of some type? Don't know if there is even a USB driver for a PC.

They specify the output as line out, but expect it to be used with headphones or earbuds? Looks like opamp might be driving output, not proper headphone amp.

They do show a picture of the circuit board. Also, there are some performance graphs and THD table.

If you want a portable, battery operated, line output DAC, maybe okay. But what happens when the battery stops holding a charge?

Personally, I would pass on this one. But, that's only me.
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Old 16th February 2018, 06:41 AM   #218
chermann is offline chermann  Austria
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Quote:
Originally Posted by Markw4 View Post
There is no SPDIF, only USB of some type? Don't know if there is even a USB driver for a PC.

They specify the output as line out, but expect it to be used with headphones or earbuds? Looks like opamp might be driving output, not proper headphone amp.

They do show a picture of the circuit board. Also, there are some performance graphs and THD table.

If you want a portable, battery operated, line output DAC, maybe okay. But what happens when the battery stops holding a charge?

Personally, I would pass on this one. But, that's only me.
i understand you completely...it was just an example (i donīt know if its possible for mods..)
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Old 16th February 2018, 06:49 AM   #219
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Quote:
Originally Posted by Adson View Post
Hello,
I'm a newbie in this matter, so, my questions, probably, are stupid. Sorry if it true.

I have the "old version" (1.04) of the board and I would like to improve power lines on it slightly. Unfortunately, there is no headroom in the selected case to place big regulators boards and I plan to:
- replace AMS1117-3.3 regulator by LT1963-3.3 in the same case
- replace 7808 regulator by something like LM1084IT-5.0
I haven't had a chance to look at that version of the board. It is possible for most of the electronics to run on 3.3v, and more volts than that would probably only be needed for the op-amps. They probably work best with +- 15 volts, but maybe they are running them on a single-sided 8 volt supply? Do you know how to measure the pins?

As far as reducing power supply related hum and noise, a fix to AVCC+ 3.3v power may enough. The digital circuitry isn't so sensitive. Op-amps would like good power, but they do have some PSRR capability.
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Old 16th February 2018, 09:04 AM   #220
freezebox is offline freezebox  Germany
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Hi Adson,


To my understanding the 7808 takes the +15V and makes a first step voltage reduction 15V->8V to not overload and maybe have better PSRR for the 2nd step 3,3V AMS1117 reg. Also 5V should work here to feed the AMS1117 reg.
I think you could also directly feed clean 3,3V to the output of the AMS1117 after removing this one.
I would also be interested for some better alternatives for 7808 and AMS1117...
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