Anybody using the new ESS Vout DAC (ES9022)? - Page 50 - diyAudio
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Old 4th January 2013, 11:07 AM   #491
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About ESS's claim that their dac chips including those entry level like es9022/3 are jitter immuned, I am wondering how this could be true. Is there any explanation on this somewhere in our forum?
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Old 4th January 2013, 11:27 AM   #492
EUVL is offline EUVL  Europe
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They have a build-in jitter reduction mechanism, whatever it is.
Immune is something else.


Patrick
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Old 4th January 2013, 11:34 AM   #493
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Thanks EUVL, that definately helps!

As you said, ES9023 datasheet does not say anything about timing requirement (thats why I asked) but I didn't look to other datasheets...

May I ask which D-FF you use. A short search at Mouser only showed me parts with 2.4 and higher propagation delays (wouldn't be a problem though if exact phase relation isn't required) and the datasheets (only looked into few) don't specify added jitter (propagation delay variation).

Daniel
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Old 4th January 2013, 11:45 AM   #494
EUVL is offline EUVL  Europe
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Fairchild TinyLogic UHS.
And I have their engineering test data, not data sheet values.


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Old 6th January 2013, 05:02 PM   #495
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by EUVL View Post
The 100R resistor of the right channel next to the silk screened letters "Gnd" is shorted to the JFET cascode source pin (first photo top right).

Suck out the solder with a solder wick to see if it will work.
If not I am afraid you might need to have the FETs replaced.

We'll mask off those pads in Batch 2 to avoid such "accidents".
But it also helps when you check the boards thoroughly for such soldering errors before power up.

Patrick
Hi Patrick,
The solder was cleaned up, reconfirmed that there is no other mistake, I powerup with 2 9V battery and it is working, the Jfet seems ok. After playing for few hours and ran out of battery so I will need to build a 12V +/- regulated power supply for it. One quick observation is the music play back has more body. I will know more after finishing the PS.

Thanks for your help.
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Old 14th January 2013, 09:44 AM   #496
syklab is offline syklab  Hong Kong
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Hi WK,
Thanks for the PPS cap, I replaced the MLCC with them and I can tell you that the difference is quite significant! The 9V battery only last for 2+ hrs and I built a +/-12V supper reg for it. I have been listening to it for over 4 hours yesterday, the sound is more sweet and didnot notice any harshness, slight forward presentation. Key thing is the JG filter transformed the 9023 dac to another level. All the listening was done on the dac with a 3875 chipamp, need to build a balance version for my Rowland.

Note: I didn't remove the 4700pf cap on the 9023 output, will try that this week. I also use 10K for R1 according to Patrick's latest JG filter Public 121217.pdf instead of the Joachim's 18.9K, will that make a large difference?

Thanks

Last edited by syklab; 14th January 2013 at 09:51 AM.
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Old 14th January 2013, 11:03 AM   #497
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Joachim included the 4700pF cap in his filter calculations, thus removing this would change one pole of the filter. Therefore it should not be removed.

Not sure though about the exact value of R1 of the latest version. The latest BOM
does not include the 18.7kOhm resistor, however according to the Fastron Inductor Group Buy thread, XEN audio provided similar values (18.9kOhm) to FRAN for the Kits.

Maybe it is possible for EUVL or Fran or JG to post the latest BOM just to avoid any misunderstandings?

Best regards, Daniel
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Old 14th January 2013, 12:00 PM   #498
EUVL is offline EUVL  Europe
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> I didn't remove the 4700pf cap on the 9023 output, will try that this week.

You should not.
It is designed to work with the 4.7nF in place.

If you use other DAC from other people (e.g. a PCM5102) then you need to add an RC of 240R 4.7n at the output, before the JG filter.

I never intended to post the BoM in the forum, as I cannot do revision here.
I shall definitely not do it again.
So in the future subscribers will get either paper copies, or download from our website.

Also it is a matter of taste. We use 10k ourselves.
But Joachim prefers 18.7k.


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Old 14th January 2013, 01:41 PM   #499
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EUVL, asking for the BOM wasn't meant to nail someone down to something, just for information or discussion and to help those that are not that deep into the math of the filters (though it's quite simple LCR ).

However I understand your point
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Old 14th January 2013, 03:02 PM   #500
EUVL is offline EUVL  Europe
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If I pose another version here, I invite more questions about which version is most update, at what post, preferably with links .....,
which cost me time that I do not have.
So for the simple sake of version management, we need to do things differently.

Things you don't think about till you have to run these things over x batches.

Easy for you to ask.
Every such request requires hours of work ....


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