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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 18th April 2011, 07:24 AM   #1
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Default DAC-END The best DAC AD1865- UPDAT 2011

After a period of DAC-END2 board design development, I received a lot of feedback from you guys - DIY’ers over the whole my country and over the world. I really appreciate your all encouragement and support, especially the full support with favorable conditions from the VNAV and DIYAUDIO forum board management. The comments from you (praise and blame) have made me think a lot and come to a determination of creating a new DAC board design that overcomes the existing disadvantages and raises the advantages of the basic design.
I am honored to present to you the new design of DAC-END up dat 2011.
Hereinafter are some of characteristics/feature that I was expected in this PCB design:

• The PBC board is designed with completely new concept.

• Optimization of the signal circuit lines, clear direction, consistency, shortest as possible, to avoid cross infection.

• The mass system circuits are AC’s isolation between the analog signal processing and digital signal processing section.

• Anti-interference design screens for the entire grid circuit

• The Optical Input port are added beside Coaxial Input

• The Electronic Surface Mounted Components are applied for complying with the new PCB optimized design.

• Re-clocking option are considered for future upgrade

I believe that your comments in the past and future come with my efforts shall make DAC-END3 board continues bringing new exciting experiences in our DIY fields; especially when you are the one who turn it into reality.

Thank you very much for your attention!
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 19th April 2011, 10:01 AM   #2
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This is cricuit
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File Type: jpg DAC-END-updat-2011-cricuit.jpg (250.3 KB, 3917 views)
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Old 19th April 2011, 10:06 AM   #3
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Sweet! Very interested.

Will there be a complete kit?
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Old 19th April 2011, 02:37 PM   #4
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Quote:
Originally Posted by CoolJazz View Post
Sweet! Very interested.

Will there be a complete kit?
yes!
thanks
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Old 19th April 2011, 02:57 PM   #5
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And this layout of DAC!
The chips are arranged very close together, noise reduction, the best signal!
The street circuit is running a separate signal layers
The road runs its own power circuit layer
GND and DGND plane separated and connected by inductors

Please see the image!
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File Type: jpg Layout-DAC-END-2011.jpg (287.9 KB, 3584 views)
File Type: jpg AGND-DGND.jpg (97.3 KB, 3235 views)
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Last edited by quanghao; 19th April 2011 at 03:07 PM.
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Old 20th April 2011, 05:23 PM   #6
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quanghao, will there be a run of boards in a group buy, I would like to participate. Let me know if you are going to do this, or a run of your last End Dac 2 boards. Thanks, John
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Old 20th April 2011, 06:38 PM   #7
mkanna is offline mkanna  United States
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Cool board layout!
I'm interested in a group buy, too.
Thankyou for pursuing this.

Michael
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Old 21st April 2011, 01:21 PM   #8
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Quote:
Originally Posted by mkanna View Post
Cool board layout!
I'm interested in a group buy, too.
Thankyou for pursuing this.

Michael
Yes! i test new PCb, i will do that!
Thanks
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Old 21st April 2011, 01:30 PM   #9
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Default The IV All in one, can use tube:5687, 6h30,6Dj8

And now is the layout for stage IV, I called all in one

1. Using different tube types, including: 5687, 6h6, 6h30, 6dj8 ...
Change the tube simply by changing the connector on the motherboard jum!

2. Can be used as a pre independence on the other tube

3.Phan Output capacitors are larger!

4. Options for the use of output transformers or capacitors or output downloads alone!
Invite your review!
Attached Images
File Type: jpg all.jpg (186.5 KB, 3102 views)
File Type: jpg IV-Pre.jpg (195.0 KB, 2979 views)
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Old 23rd April 2011, 06:08 AM   #10
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This is test PCB
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File Type: jpg PCb-DAC-test.jpg (339.8 KB, 1164 views)
File Type: jpg PCb-IV-test.jpg (297.6 KB, 1037 views)
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