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Old 25th December 2013, 01:09 PM   #161
Scuba is offline Scuba  Romania
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Thanks for confirming this, MisterRogers!
We should "thank" Apple .
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Old 30th December 2013, 05:50 PM   #162
luchoh is offline luchoh  United States
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Default Not sure it's Apple, though it could be.

@Scuba, there is definitely a problem with the XMOS board being connected directly to a USB port on a Mac: I tested with an old MacMini 2006 (USB2), newest MacBook Pro 2013 (USB3), MacbookPro 2009 (USB2).

The LED by the USB connector sometimes just gleams instead of glowing steadily. This is when the XMOS card won't be recognized. Unfortunately I couldn't figure out how to reproduce the issue - it might be related to how much power other components are drawing at the same time, but this is pure speculation.

What I was doing to make it work was plugging in and out and switching USB ports until the LED glows steady. Then I know it would work.

It always works through a powered hub. It also always works when I added an external dual power supply.

Go figure...
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Old 3rd January 2014, 08:28 AM   #163
joro_s is offline joro_s  Bulgaria
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Hi,

XMOS board was designed to meet USB standards, with some reserve about the power supply. The LED "sometimes just gleams instead of glowing steadily" does that if the input voltage is lower than 4.3V Wiki; doc. It is possible, if battery of the MAC is discharged this voltage to be dropped or the computer reduces the consumption of external drives, to save energy.

The consumption is higher, because I on purpose avoid SMPS. So the consumption is less than 400mA, which is sufficient margin to the maximum specified 500mA. When using the SMPS, the power consumption falls below 150mA, but with increased background noise caused by the regulator.

Regards,
Joro
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Old 3rd January 2014, 01:08 PM   #164
Can you say Audio?
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Hi Joro. There's definitely something going on here that isn't related to power limits. My builds use dedicated PS for USB & DAC, and are not detected in any of my 3 macs with nothing else USB plugged in to the computers.

Not sure what's going on, but power should not be the issue here.
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Old 4th January 2014, 07:43 PM   #165
Scuba is offline Scuba  Romania
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My kit behaves slightly different: the led on the AK4396 does not always light-up after power-on. I have to power-cycle the power supplies 2-3 times to get it to light up.
The Ak4396 board is powered from a Salas shunt with 450 mA total current, U=5.14 V, and the XMOS board from a Salas shunt with 620 mA total current, U = 5.09 V .
It has nothing to do with the USB cable being connected or not.

I can confirm what MisterRogers said: once the combo is powered, the XMOS is not detected by the Mac OS if connected directly to the computer's USB ports (also not cable related, because I have tried 4 different cables with the same results).
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Old 8th January 2014, 08:35 AM   #166
joro_s is offline joro_s  Bulgaria
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Hi,

Sorry for my late answer, but I have to find MAC. My friend has MAC Unibody 2008, with only USB 2.0 ports. MAC OS X 10.9.1.

Quote:
Originally Posted by Scuba View Post
My kit behaves slightly different: the led on the AK4396 does not always light-up after power-on.
The LED on the AK4396 board is for the Filter, and has nothing in common with the power supply. Could you please do this: install the jumpers on both PCB boards and share the result.

Quote:
Originally Posted by Scuba View Post
I can confirm what MisterRogers said: once the combo is powered, the XMOS is not detected by the Mac OS if connected directly to the computer's USB ports.
If there is power supply for the USB part, and after that the USB cable is plug to the computer - one may have to wait 20 seconds, so the board can be recognized, by the computer. These 20 sec. may be annoying to someone, but they are put for compatibility between "old" and "new" hardware and different OS.

If the USB (MAC) ports are 3.0 (for a pity I can't find that MAC) there may be a problem with the recognition of the board, judging from some threads on the apple support from their official page. Here are the links:
https://discussions.apple.com/thread...&tstart=90
https://discussions.apple.com/thread...rt=15&tstart=0

Since I haven't tested MAC with USB 3.0 ports, I don't know what exactly happen, but from I read from your posts guys, that if one USB 2.0 hub as a "middleman", XMOS board will work through USB 3.0 port

The Mac, which I tested there weren't problems with recognition of the board, everything was smooth and according to the expectations.

Some good news for Android users.

I've tested the device with Samsung Galaxy S4, HTC One X by using this program,
https://play.google.com/store/apps/d...audioplayerpro
I've tested it up to 384kHz and works perfect. Of course with external power supply for the USB part. If one can install this program (there is a trial) and have USB OTG, XMOS board must be working. If someone test his Android device, please share.

Regards,
Joro
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File Type: jpg MAC.jpg (553.5 KB, 545 views)
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Old 8th January 2014, 01:21 PM   #167
Scuba is offline Scuba  Romania
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Hi Joro,

Thank you for the reply.
I knew that the issue with the USB ports is Apple related, there are other USB Audio devices that do not work, too. On my PCs I did not have any problems.

I am aware of the delay when the USB cable is plugged, as I keep the Audio Midi Setup app open, to see when the XMOS board is recognized.

I will try to power the board from USB again.
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Old 8th January 2014, 05:45 PM   #168
judo is offline judo  Hungary
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Quote:
Originally Posted by joro_s View Post
Some good news for Android users.

I've tested the device with Samsung Galaxy S4, HTC One X by using this program,
https://play.google.com/store/apps/d...audioplayerpro
I've tested it up to 384kHz and works perfect. Of course with external power supply for the USB part. If one can install this program (there is a trial) and have USB OTG, XMOS board must be working. If someone test his Android device, please share.

Regards,
Joro
I have tried this too with my Nexus 7 and Dac End R dac (I replaced the Amanero with your board) and it is working. Unfortunately this works not with Android but how the developer says "their own usb driver what is written from scratch". Google do not want to let normal usb audio in android as for example in linux.

Of course you can root the android device and load some ROM, not so easy.

Last edited by judo; 8th January 2014 at 05:57 PM. Reason: a remark
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Old 11th January 2014, 08:46 PM   #169
yoke is offline yoke  Croatia
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Hi...will this work for ;
Nexus 7 > usb to i2s > i2s input mini DSP (2X4) ???
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Old 14th January 2014, 01:39 PM   #170
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Hi there.

I'm wondering about the DAC of choice for the interface card.

Has anybody auditioned both DACs? PCM5102 and AK4396?

I wouldn't require DSD.


Thx

SC
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