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ES9038Q2M Board
ES9038Q2M Board
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Old 8th August 2018, 09:19 PM   #2241
occip is offline occip  France
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Default Tone board test

Hello,
I've received a tone board (usb xmos + es9038q2m+ with i/v stage all integrated ). I've done a small comparison with my custom board ( avcc mod , 0 15v supply and thd compensation, stock buffer).

As you can see, the noise level is very good , not too bad for a usb device . Thd is higher than expected given it uses the i/v stage, I wonder if the thd compensation is activated. Not shown here, but the tone board has better channel separation.
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Old 8th August 2018, 09:33 PM   #2242
Markw4 is offline Markw4  United States
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@occip: Do you have a link where we can take a look at 'tone board?'

Also, don't know if you have separate left and right AVCC supplies? If so, and channel separation isn't that good, maybe worth trying adding a whole lot of power supply filter capacitance for the AVCC supply and for the voltage output opamp. I have seen channel separation issues before that turned out to be a hint that PSRR wasn't quite as good as I was expecting. I used some big electrolytics and a few 0.1uf and 1uf film caps to remedy the situation I had like that.
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Old 8th August 2018, 09:41 PM   #2243
occip is offline occip  France
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Quote:
Originally Posted by Markw4 View Post
@occip: Do you have a link where we can take a look at 'tone board?'
here is :
Tone Board: Hi-Res Audio Board Designed for Music Fanatic.
schematics are on the docs page :
regarding my avcc supply i'm using one aop plus 1 1500uf on each channel (-86db channel separation)
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Old 8th August 2018, 09:58 PM   #2244
Markw4 is offline Markw4  United States
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How about your +-15v power? That's what I found needed more capacitance.
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Old 8th August 2018, 10:03 PM   #2245
occip is offline occip  France
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Quote:
Originally Posted by Markw4 View Post
How about your +-15v power? That's what I found needed more capacitance.
I've added 6800uf but the 50 hz peak is still visible, maybe a good buck converter will help to remove the peak (and move it at higher frequency )
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Old 8th August 2018, 11:02 PM   #2246
Mikett is offline Mikett  Canada
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Khadas Tone Board USB HiFi Sound Card Hi-Res Audio XMOS DAC 384KHz Stereo Audio | eBay

The description has this to be a 4 layer board as well. One needs still to get a VIM. So it looks like for $200, you're in with an XMOS with a SiTime Crystal.

The design looks to be a lean mean get the job done with a cost constraint on the designers. On paper they appear to have done what I commented on recently. The value engineered the design.

So we just need for someone to assess its performance relative to the cost and does it qualify as a poor man's decent DAC.
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Old 8th August 2018, 11:26 PM   #2247
Mikett is offline Mikett  Canada
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It looks like I am mistaken BIG TIME there is no need for a VIM.
Khadas Tone Board User Manual | Khadas Docs
For $99 you're into a USB class 2 DAC using the XMOS U208 coupled with a SiTime crystal. Whoa. I purchased the XMOS with SiTime for about $40 alone. Is this real? Sounds like what I need for video.
The noise is possibly a USB noise issue. I wonder if one can patch in a clean 5V into a USB cable and not use the 5V from say the laptop.

Last edited by Mikett; 8th August 2018 at 11:34 PM.
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Old 9th August 2018, 12:20 AM   #2248
Markw4 is offline Markw4  United States
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Depending on how the Tone Board is intended to be used, one might need to know how to program the XMOS chip and the DAC chip over I2C bus. But, it might make a much better starting point than one of the Chinese boards. Clock is one of the new MEMs, but don't know how it is for phase noise down at 10Hz and 1Hz.

Last edited by Markw4; 9th August 2018 at 12:27 AM.
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Old 9th August 2018, 01:03 AM   #2249
Mikett is offline Mikett  Canada
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That's what I thought at first but the instructions clearly indicate. Read the instructions. Install Driver into Windows. Plug in USB cables at both ends. Connect to your amplifier. Voila!

I elected to get one of those newer mems on my XMOS board I recently received. Well, I don't have one of the normal crystals to compare but it kills the 4392 SRC. None of that high end distortion that the 4392 imparts, the soundstage and depth is the same and the clarity/distortion to my ears has improved. In my system the SPDIF delivery whether optical or coax was so bad that the SRC initially patched it up a bit but jitter still dominated....and there's another very interesting side to that as well as regards the analogue stage but I will not conclude until I put in a decent Crystek crystal.
Ok, reality check time. I just ordered a crystek crystal a couple days ago. That was $30 by itself. Xmos board was $40. Total of $70 for upgrades to any board and that does not include the DAC board yet, op amps etc.

For $99, even it worked slightly better than the stock 9038Q2M Chinese board and judging by the measurements it likely will, then this looks to be a gamechanger but understand it is likely not upgrade friendly because of the integration.

Here's how you look at it from my perspective. For the budget user, are they likely to own a high end transport with a low jitter SPDIF? NO. If not, how can we deliver the bits to the DAC the best for a given cost for a budget user....Use asynchronous USB. thus XMOS. An Amanero USB board is close to the cost of the tone board!
Remember we have to sell this and put bread on the table. OK, what else do we need to do. Put in some separate power supplies for AVCC L and AVCC R and one for the clock etc. We can put in 5 separate power supplies. OK boss. How much money left? Well, we still need to put in the DAC. OK boss, Now what is the minimum we need for the IV section. three op amps. All dual. OK Boss. What's left? Oh yeah that crystal thingy. What is the best bang for buck and still not exceed our budget. That mems thing. OK. What else. We need good grounds and short paths So we will need a 4 layer board. Any room for that. Lemme check. I think we can do it.,,,if we have to survive, what can we sell it for ? I think under a $100 and it comes with a type C cable.

I never thought I'd see this thing so quick for so little. I really wonder how it sounds. They say auditioning was part of the design process. This is going to be interesting. Real interesting....not from a DIY perspective because it dampens the hobby.

Last edited by Mikett; 9th August 2018 at 01:05 AM.
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Old 9th August 2018, 01:06 AM   #2250
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by Mikett View Post
That's what I thought at first but the instructions clearly indicate. Read the instructions. Install Driver into Windows. Plug in USB cables at both ends. Connect to your amplifier. Voila!
Okay, how do you select the reconstruction filter you want through the Windows driver? Do the settings appear in the Windows sound control panel? How do you set the DPLL bandwidth? Distortion compensation? At the moment, I am still feeling kind of skeptical, but maybe some very basic music playing functionality could exist. What if you wanted to use an AK4137 with it? More questions than answers at the moment. But, it looks like there might be some info on their website if someone does want to do more...

Last edited by Markw4; 9th August 2018 at 01:10 AM.
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