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Old 16th April 2013, 03:28 PM   #2191
1audio is offline 1audio  United States
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Quote:
Originally Posted by cviller View Post
Sorry guys, but I don't see it.
The gnd plane on solder layer (brown polygon Open-source USB interface: Audio Widget) is unbroken all the way from DAC chip to connector and Iout+/Iout- are routed closely together from chip to connector - where is the dipole antenna?
It can be hard to see details on an image like this, especially when you can't be sure of what you can't see. You also do have what seems to be a ground adjacent to one of the traces. If its too close it could unbalance the network, otherwise it seems pretty good.
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Old 21st April 2013, 03:13 PM   #2192
cviller is offline cviller  Denmark
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I have made a few changes: ADC connector added, correct SPI pins used, 3.3 V regulators swapped and better clearing of the current out traces.

Quote:
Originally Posted by 1audio View Post
You also do have what seems to be a ground adjacent to one of the traces. If its too close it could unbalance the network, otherwise it seems pretty good.
The polygons on component side are actually psu - is that bad approach in practice? One of the few things I remember from high speed subjects at university was the importance of short signal path for supplies&gnd, as well as the coolness of using the layers to make ultrafast plate capacitors in the pico range...

The first image show gnd layer - brown is AGND and cyan is DGND. Second image show the signal traces and small sections of supplies. Any comments are welcome.
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Old 23rd April 2013, 05:29 AM   #2193
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It looks like you have done an excellent job of pulling it together. I probably would have given up and gone to a 4 layer PCB but I get lazy.
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Old 23rd April 2013, 05:38 AM   #2194
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The Linux Kernel patch created for the CM6631 and the Via chip also got the Audio Widget working without the Linux hack. I posted the patches here Linux Audio the way to go!? for those ready to build kernel modules. Otherwise if you can get a 3.9 Kernel the patch is already in it (or so I hear).
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Old 23rd April 2013, 07:29 AM   #2195
cviller is offline cviller  Denmark
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Quote:
Originally Posted by 1audio View Post
It looks like you have done an excellent job of pulling it together. I probably would have given up and gone to a 4 layer PCB but I get lazy.

Regarding the ADC connector, I have taken the master clock directly from the isolator, so it is the same ~22MHz (of course with a small delay) used for the DAC master clock. Is that the most optimal clock for the ADC?
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Old 23rd April 2013, 02:03 PM   #2196
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I'd love to see Google add native support for USB Audio Class 2.0 drivers in Android. Then, using my Android phone or tablet, I could play high res files. It would also be great if a desktop version of Android were developed and we could build HTPCs running Android.

If you'd also like USB audio support in Android, go here:

https://code.google.com/p/android/is...stars&id=24614

and vote!

Be sure to click on the star at the bottom of the page to register your vote.

Last edited by greggp; 23rd April 2013 at 02:08 PM. Reason: more info
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Old 23rd April 2013, 02:18 PM   #2197
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I believe the latest Samsung devices (Note2 Tab ??) do support USB audio. I'll test that theory soon.
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Old 23rd April 2013, 03:28 PM   #2198
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Quote:
Originally Posted by 1audio View Post
I believe the latest Samsung devices (Note2 Tab ??) do support USB audio. I'll test that theory soon.
Is there native USB audio support on Android?

That's what I want.
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Old 21st May 2013, 11:37 AM   #2199
borges is offline borges  Norway
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100 fresh new AB-1.2s just arrived on my door :-) That means I'm no longer sold out!

BÝrge
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Old 25th May 2013, 09:10 AM   #2200
Bonsai is offline Bonsai  Taiwan
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Just got my QNKTC DAC going Borge. Problem was the set up in JRiver MC.

Very nice DAC I have to say - exceptionally clean sound.

Any chance of an optical interface?
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