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Old 8th March 2005, 04:19 PM   #1
Nisbeth is offline Nisbeth  Denmark
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Talking GB of PCB's for USB->SPDIF converter at head-fi

In case anyone's interested, there's an ongoing group buy of a small PCB for a USB->SPDIF-converter based on TI's PCM2902 IC. The head-fi thread for the group-buy is here:

http://www6.head-fi.org/forums/showthread.php?p=1279489

and the original thread for the project is here:

http://www6.head-fi.org/forums/showthread.php?p=1279489


/U.
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Old 11th March 2005, 06:44 PM   #2
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Hey cool, I want one
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Old 11th March 2005, 08:13 PM   #3
tiroth is offline tiroth  United States
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Anyone know, can you stick a whole bunch of these USB DACs into a computer and use it with ASIO software?

To anyone who has not journeyed to headfi, these boards are silly cheap.
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Old 11th March 2005, 08:21 PM   #4
Nisbeth is offline Nisbeth  Denmark
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The information is available here as well: http://www.diyaudio.com/forums/showt...176#post595176


/U.
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Old 11th March 2005, 08:32 PM   #5
seoman is offline seoman  Netherlands
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@ Tiroth

Try a seccond hand terratec EWS88D.
That's 9digital in 9 digital out. ASIO and ADAT interface
I have seen prices of 100

(I have it's DAC based brother MT version and i'm very pleased with its asio performance)
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Old 14th March 2005, 06:22 PM   #6
tiroth is offline tiroth  United States
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Thanks for the tip!
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Old 15th March 2005, 12:27 AM   #7
gmarsh is offline gmarsh  Canada
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ooh, neat... however, I just sent out some gerbers for this little USB->optical board about half an hour ago.

I'll post the eagle files if anyone wants them. The picture was done in Eagle3D, which is one of the handiest programs ever created...
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File Type: jpg usbtospdif.jpg (39.9 KB, 1024 views)
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Old 15th March 2005, 06:33 AM   #8
Nisbeth is offline Nisbeth  Denmark
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Quote:
Originally posted by gmarsh
ooh, neat... however, I just sent out some gerbers for this little USB->optical board about half an hour ago.
Very nice!

Quote:
Originally posted by gmarsh
I'll post the eagle files if anyone wants them.
I do!


/U.
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Old 19th March 2005, 12:32 AM   #9
gmarsh is offline gmarsh  Canada
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Here's the eagle files (usbspdif.brd, usbspdif.sch) and "mine.lbr", which contains a few custom parts used in the design.

Some parts notes:

- USB connector is a Molex 67068.
- optical transmitter is a TOTX179P... make sure you get the P part, or it won't fit in the PCB.
- C7/C8 are 0603-case, NP0 dielectric.
- C5/C6/C9 are 0805-case, 10uF, 6.3V X5R ceramics.
- All other capacitors are 1uF, 0603, 6.3V X5R's.

You can get everything from Digi-key.

I ordered ten of these PCBs; they occupied the remaining space on a larger board which I ordered. I'll probably use 3 or 4, so I might mail out the remainder to people if anyone's interested.

edit: and no flames over using an optical interface instead of coaxial.
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File Type: zip usbspdif.zip (29.0 KB, 229 views)
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Old 19th March 2005, 11:32 AM   #10
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How much per board?
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