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Old 26th April 2013, 06:55 PM   #261
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Join Date: Aug 2012
Quote:
Originally Posted by Astaro View Post
weiliang , you have to put in the first post or theme for each DAC graphics like these http://img04.taobaocdn.com/imgextra/...!647667811.jpg
Click the image to open in full size.
It's great to add credibility to your devices. =)

Yes the test result is mine...
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Old 26th April 2013, 07:00 PM   #262
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
not clear to me : is this the RMAA measurement of the EMU1212 soundcard in loopback or your dac ?
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Old 26th April 2013, 07:04 PM   #263
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Quote:
Originally Posted by dbbloke View Post
Thanks, starting to save my money.
Torrodial or 2 rcore???
use toroid transformer is more better that R-core ones after comparing and testing, and the toroid transformer is customize from factory, it is special for this DAC.
if you prefer it, you can ask the site.they will reply you.Thanks.

regards
weiliang
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Old 26th April 2013, 07:24 PM   #264
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Quote:
Originally Posted by alkasar View Post
not clear to me : is this the RMAA measurement of the EMU1212 soundcard in loopback or your dac ?
this is RMAA for the DAC9 AK4399 not EMU1212..
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Old 20th May 2013, 11:18 PM   #265
Trileru is offline Trileru  Romania
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Join Date: Dec 2010
I'm interested in the new es9018 dac from weiliang but it gets a bit expensive for me at about 230$ with assembled board + case + usb. I could get a custom made torroid transformer locally for a good price. The thing is I'm now using a M-Audio FastTrack Pro sound-card and I want to upgrade the digital to analog conversion. I have a modded ta2020 amplifier and another sherwood s-5000 tube amp in restoration. I will use them with a pair of fostex fe206e that I am also building the enclosures for (I only need to glue them, everything si cut to spec )
So is it worth to upgrade the M-Audio sound card to this DAC? I was also looking to the Zero DAC and was wondering if there'd be much difference between a modded Zero and stock es9018.
I like to replace stuff in gear I get and Zero is a good starting point, especially with all the info available. This would be my first DAC, I have no experience with them and also don't know much about the electronics involved in DACs. I can find my way around a tube amp or a small chip amp but DACs...not so much. I'd like to get my hands dirty but I am a bit reluctant about the es9018 as there's not much info regarding this specific build (and no hope for a schematic as it seems from weiliang).
This is for weiliang:
Providing schematics, even in private is a good way to stand behind your product. It would help many diy-ers (you are on diyaudio.com) with troubleshooting/improving/modding for the sake of it of your product. If you are afraid about someone else copying your design...well...if that someone wants to do it he will do it, and not in a long time!
You'd encourage the sales of your product as there's transparency. So far, for me, it's a bit of a gamble to buy the dac9 or es9018 version. It's also pretty hard to start a modding thread (something that would boost your sales) if we can't follow a schematic, a good build would attract some attention. Even if it's not the best integration there are a lot of skilled people on this forum that would take your product to the next level.
I hope I didn't offend you with my ideas, I just see it that way and I'm sure many more are too.
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Old 21st May 2013, 01:11 AM   #266
bcmbob is offline bcmbob  United States
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Join Date: Dec 2009
Location: Bay City, Michigan
To reply to part of your post..over the years I have collected several "sound card" DACS. A Presonus Project, M-Box2, Lexicon Omega and M-Audio Delta 66. They are all good for recording/studio work, but none compare to what is available with good quality DIY designs for what we like to call "Audiophile" listening. The cost/complexity range is wide but it's highly likely you will enter a new level building this or one of the other DACs supported here on the forum. Unfortunately, if you don't have access to hear some completed units, you will have to take the path I did - build more than one and find out how it sounds in your particular system. You can always sell what doesn't appeal to you and it might be just what someone else is looking for.
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"Arrange Whatever Pieces Come Your Way."
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Old 22nd May 2013, 05:09 PM   #267
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Location: Hong Kong
while everyone is getting exciting with ES9018 & DAC7
For a absoulte beginner like me, play and learning(try improving or messing up) the electronics with
my little dac5 seems to a good start.

v1.9
orginal with LT1117 instead of AMS1117
Click the image to open in full size.
1. LM317/337 replace with LT317/337, get a crisppy sound.
2. Remove biasing A for opamp(LME49720), is getting too hot, suggested by weilang.
3. by adding 2 extra capacitors on the main capacitor, i get a bit more deep bass
4. replace the orginal BC013 10v/100uf on wm8741 pin8&9 with a oscon 6.3/47uf for digital supply.
* Muse 50v/47uf and elna 35v/0.47uf
Click the image to open in full size.

**3&4 has a very much improvement, especially with oscon SP on digial circuit. more pleasant to listen with this little dac.

share my 0.2

I may try to replace the opamp recitifier circuit with some fast soft recovery diodes and replacing the 8741 power regulator by adding a LT1963 extra circuit on it in the near future.
Attached Images
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File Type: jpg P1090957.jpg (148.6 KB, 498 views)

Last edited by kentdream; 22nd May 2013 at 05:16 PM.
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Old 23rd May 2013, 06:16 PM   #268
phase is offline phase  United States
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Join Date: Oct 2004
The only thing(s) I have changed on mine are all of the .1 uf box capacitors, and it made a huge difference in the SQ. More bass, way better timber(tone), and it also plays louder now(?), so I am happy. I do have the opa627s.

I used some of the ERO Vishay 1837 I found for less than .50 each. They were a tight fit, had to load most from underside of the board.

The thing was very quiet at first after the cap swap, but I turned the volume way down, and went to bed. When I got up, I could hear a bumping coming from the garage, and the sound had cleared up for the most part. I would imagine it will get slightly better over the next few days.

Glad to see some interest in modding going on for such a deserving design, thanks weiliang.
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Old 26th May 2013, 08:05 PM   #269
phase is offline phase  United States
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Join Date: Oct 2004
Can anyone show me where the output resistors are on my version 1.9?

I have some foil resistors to try in their place, but haven't been able to locate any 75 ohm resistors without lifting anything anyways.
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Old 2nd June 2013, 04:14 PM   #270
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Join Date: Dec 2011
Location: Hong Kong
Quote:
Originally Posted by phase View Post
The only thing(s) I have changed on mine are all of the .1 uf box capacitors, and it made a huge difference in the SQ. More bass, way better timber(tone), and it also plays louder now(?), so I am happy. I do have the opa627s.

I used some of the ERO Vishay 1837 I found for less than .50 each. They were a tight fit, had to load most from underside of the board.


Glad to see some interest in modding going on for such a deserving design, thanks weiliang.
SQ, what means SQ? Please enlighten me

1837 0.1uf(104) vishay, this one?
Click the image to open in full size.

I have made some other modification on the digial circuit part, need a few days to see how i would like it.
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