Author Topic: 8 Channel USB sound device for LaserBoy  (Read 55751 times)

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Offline johannesgj

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Re: 8 Channel USB sound device for LaserBoy
« Reply #60 on: November 06, 2009, 05:41:06 am »
nice piece of hardware pefect build!!!
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Offline James

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Re: 8 Channel USB sound device for LaserBoy
« Reply #61 on: December 10, 2012, 05:59:24 pm »
This might be useful! :)


This is the back of the USB SND8 sound card typically used to make a LaserBoy DAC.


Laser signals are in magenta. The yellow L & R is left and right audio. These do not need to be tapped before the audio output decoupling caps. It's better to just use the associated jack for standard stereo audio out.
« Last Edit: December 20, 2012, 05:03:37 pm by James »
LaserBoy is Sofa King Cool!
But it will never be Alpha King Done!

Offline James

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Re: 8 Channel USB sound device for LaserBoy
« Reply #62 on: March 17, 2013, 10:04:07 pm »
For some reason, the last two USB-SND8 boards I modified have the first 2 channels (front left and right aka X and Y) reversed!

No big deal. Just flip the channels in the amp board wiring. But I thought I should report this!

You might find this or not.

James.  :)
LaserBoy is Sofa King Cool!
But it will never be Alpha King Done!

Offline James

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Re: 8 Channel USB sound device for LaserBoy
« Reply #63 on: June 19, 2013, 04:38:54 pm »
I have also noticed that when using this card with the Raspberry Pi and presumably any other ALSA Linux system, the side and rear channels are transposed. In other words, channels 5 and 6 are swapped with channels 7 and 8!

I know there is a way to change the ALSA sound device routing to make ALSA order the channels the same way as Windows, but I don't have that figured out yet.

In the mean time, I just swapped the wires.

James.
LaserBoy is Sofa King Cool!
But it will never be Alpha King Done!

 

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