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Old 6th November 2010, 03:57 AM   #91
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The isolation method I am using has nothing to do with the USB PHY.

There will be no penalty for being bus powered and everything will be locally regulated. The PCM output need not be coupled to the PC in any way (not even GND).

I received the parts I am using for isolation today, and will be testing them tomorrow.
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Last edited by Russ White; 6th November 2010 at 04:01 AM.
 
Old 6th November 2010, 04:01 AM   #92
jkeny is offline jkeny  Ireland
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In any case, if you are paranoid about the USB bus power, it is a simple matter to break out the power and ground leads from a USB cable and apply the 5 VDC supply of your choice.
It just sounded to me like you were giving Leif advice to cut the power & ground of the USB cable & connect in a 5V DC supply? This can possibly cause damage to the USB device as the differential USB signal has no longer a reference voltage & could damage the USB receiver chip in the USB device connected!
 
Old 6th November 2010, 04:04 AM   #93
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Unfortunately, not being bus powered is a bit more involved than just supplying 5V.

In this case, there is nothing to be gained by using external power anyway.

In fact by going bus powered you save quite a lot of trouble, not to mention unnecessary hardware.

The key really is just to have good regulation and bypass.
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Old 6th November 2010, 04:07 AM   #94
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Default I...

assumed people here would be smater than that, my bad! Just keep the ground intact between the computer and USB receiver, but reference it for the external supply.
 
Old 7th November 2010, 07:21 PM   #95
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hello B
everybode cannot be as smart as yourself
anayway I had no intention of cutting anything
just wantes to hear what TPAs argument for choosing their solution
I knew it would be well thought out
best
Leif
 
Old 10th November 2010, 11:05 AM   #96
lauret is offline lauret  Netherlands
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I guess the XMOS chip will already be supported in linux, but will the ALSA driver also be able to play music on 32/384?
I'm sure I am not the only one curious about linux compatibility of this USB-receiver. Can someone knowledgeable comment on this?
 
Old 10th November 2010, 01:42 PM   #97
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Quote:
Originally Posted by Russ White View Post
The isolation method I am using has nothing to do with the USB PHY.

There will be no penalty for being bus powered and everything will be locally regulated. The PCM output need not be coupled to the PC in any way (not even GND).

I received the parts I am using for isolation today, and will be testing them tomorrow.
Keep us informed, thanks
 
Old 10th November 2010, 04:29 PM   #98
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Originally Posted by lauret View Post
I'm sure I am not the only one curious about linux compatibility of this USB-receiver. Can someone knowledgeable comment on this?
I just bought the xmos UAC2.0 dev board with the intention of using it under Linux. At least one person here on diya has reported running it without problems so I'm assuming it'll work. Since my understanding so far is that the TP offering will use the same xmos firmware but optimized hardware, this should be a good indication. I'm hoping I'll get around to testing it this weekend.
 
Old 10th November 2010, 04:34 PM   #99
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It will not be the same firmware. It will be optimized firmware and hardware.

It will work on Linux if there is a driver that support USB audio device 2.0.

I simply have not checked into that yet as I will be using it with only mac and windows in the near future.
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Old 10th November 2010, 06:01 PM   #100
LeonvB is online now LeonvB  Netherlands
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