iport Express

neil_kaye · 21st November 2008, 06:32 PM

Hi,

Has anyone found a way to have the iport Express output an audio signal through its USB port?

Thanks
Neil

cetoole · 21st November 2008, 09:21 PM

If you are referring to the Airport Express, it only has an spdif optical output, unless you are willing to recase the thing, in which case, the internal DAC (and SPDIF output) is a TI PCM2705, which is a USB interface. You could rebox the thing, say, inside a hammond case, maybe wire the antenna to the back panel along with a USB jack.

Pics of the internals (not mine): http://www.vonwentzel.net/ABS/Dissec...ess/index.html

neil_kaye · 21st November 2008, 10:37 PM

Cetool,

Sorry Airport Express it is.
No problem with the reboxing. Any idea how to access the USB pins?

cetoole · 24th November 2008, 04:01 AM

Neil,

Look at the following pictures, the first being of the bottom of the audio board, showing the connection to the mainboard, and the second being the mainboard, showing where the audio board plugs in. You would need to figure out which pins on that connector correspond with the necessary pins on the audio board, and tap them on the mainboard. If it wasnt for the fact that Apple, in their infinite wisdom, sonically welded this thing's case solid, I would just suggest cutting the connections to the printer USB jack, and wiring the USB traces to that port directly. You could still do that if you have no need for wireless printing, or use a panel mount jack on the new case.

http://www.vonwentzel.net/ABS/Dissec...SCN8884-pp.jpg
http://www.vonwentzel.net/ABS/Dissec...SCN8933-pp.jpg

glt · 24th November 2008, 05:09 AM

You can't get USB out from PCM chips. Only USB in. The PCM 2705 has USB in and SPDIF out. But the real advantage of the Airport Express is getting bit-perfect transfer through wifi or ethernet. I've read the new Airport express (the 811n version) does not use the PCM chip

21st November 2008, 06:32 PM	#1
neil_kaye diyAudio Member Join Date: Dec 2005 Location: San Francisco	iport Express Hi, Has anyone found a way to have the iport Express output an audio signal through its USB port? Thanks Neil

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21st November 2008, 09:21 PM	#2
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	If you are referring to the Airport Express, it only has an spdif optical output, unless you are willing to recase the thing, in which case, the internal DAC (and SPDIF output) is a TI PCM2705, which is a USB interface. You could rebox the thing, say, inside a hammond case, maybe wire the antenna to the back panel along with a USB jack. Pics of the internals (not mine): http://www.vonwentzel.net/ABS/Dissec...ess/index.html

21st November 2008, 10:37 PM	#3
neil_kaye diyAudio Member Join Date: Dec 2005 Location: San Francisco	Cetool, Sorry Airport Express it is. No problem with the reboxing. Any idea how to access the USB pins?

24th November 2008, 04:01 AM	#4
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	Neil, Look at the following pictures, the first being of the bottom of the audio board, showing the connection to the mainboard, and the second being the mainboard, showing where the audio board plugs in. You would need to figure out which pins on that connector correspond with the necessary pins on the audio board, and tap them on the mainboard. If it wasnt for the fact that Apple, in their infinite wisdom, sonically welded this thing's case solid, I would just suggest cutting the connections to the printer USB jack, and wiring the USB traces to that port directly. You could still do that if you have no need for wireless printing, or use a panel mount jack on the new case. http://www.vonwentzel.net/ABS/Dissec...SCN8884-pp.jpg http://www.vonwentzel.net/ABS/Dissec...SCN8933-pp.jpg

24th November 2008, 05:09 AM	#5
glt diyAudio Member Join Date: Oct 2004	You can't get USB out from PCM chips. Only USB in. The PCM 2705 has USB in and SPDIF out. But the real advantage of the Airport Express is getting bit-perfect transfer through wifi or ethernet. I've read the new Airport express (the 811n version) does not use the PCM chip