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Old 15th December 2007, 04:55 PM   #21
00940 is offline 00940  Belgium
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Quote:
Originally posted by Radian
but after I had so many problems with the PCM2707 dieing on me, I gave up on it.
Sorry for going out topic... Are you using a simple gate to tell the PCM2707 when the USB is connected or not, while in self-powered mode ?

See an exemple : http://www.dddac.de/files/dddac-usb-1543-dac32.pdf
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Old 15th December 2007, 05:56 PM   #22
dddac is offline dddac  Germany
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Quote:
Originally posted by analog_sa


Now this is amusing. Respected by whom? Any half-assed EE with no ears will predict that the AK4396 will walk over an ancient, low-performance, budget DAC. One of those rare moments when theory and practice produce identical results

Here we go again

Audio design is not about clever statements, it is about doing the right implementation and you will be hammered by the quality and musicality you can get out of an ancient 1543

To go ON topic, My experience with simple and straight forward implementation of the 2707 gives a clearly improved sound over SPDIFF

I see no issue in the PC connections and ground, as long (and that is what I do) play with a notebook running on batteries during music play back

Klaus, if you are in a hurry trying some USB dac, drop by and pick one up...
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Old 15th December 2007, 07:07 PM   #23
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Quote:
Originally posted by dddac


I see no issue in the PC connections and ground, as long (and that is what I do) play with a notebook running on batteries during music play back


I use one of your 2707 boards and have never had any issues with hum or anything else. Still, galvanic isolation is tempting.

Regarding the 1543, yes, i have been hammered
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Old 15th December 2007, 09:23 PM   #24
00940 is offline 00940  Belgium
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Quote:
Originally posted by dddac
I see no issue in the PC connections and ground, as long (and that is what I do) play with a notebook running on batteries during music play back
My worst experience of USB is a compaq laptop running on batteries... I don't know why but the noise floor of a simple pcm2702 dac (powered with an external supply) out of it was terrible. Once the pcm2702 connected to my desktop, all the noise was gone.
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Old 16th December 2007, 01:57 PM   #25
Radian is offline Radian  Germany
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Originally posted by dddac

Klaus, if you are in a hurry trying some USB dac, drop by and pick one up...
Yes I will.
Hey when did you move to Wiesbaden?

Greets,
Klaus
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Old 17th December 2007, 02:22 PM   #26
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Most people seem to forget that a laptop battery is typically 19 volts so theres probably still a dozen switching regulators running. A lot of the cpu stuff is <3.3v now.
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Old 17th December 2007, 07:03 PM   #27
Radian is offline Radian  Germany
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I don't care if it has 100 regulators, it's about what I hear with battery power or PS. The PS has hum and the battery does not.
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Old 17th December 2007, 08:22 PM   #28
dddac is offline dddac  Germany
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Originally posted by Radian


Yes I will.
Hey when did you move to Wiesbaden?

Greets,
Klaus

August last year
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Old 19th December 2007, 11:56 AM   #29
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Quote:
Originally posted by 00940

My worst experience of USB is a compaq laptop running on batteries... I don't know why but the noise floor of a simple pcm2702 dac (powered with an external supply) out of it was terrible. Once the pcm2702 connected to my desktop, all the noise was gone.
I also encountered the same problem with an old Compaq laptop (EVO N200).


After a few years, I built a USB to SPDIF converter with PCM2706, and connected it to another laptop from Toshiba. The background was dead silent.
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