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Old 8th January 2012, 11:54 AM   #21
regal is offline regal  United States
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Originally Posted by ThorstenL View Post
Hi,



Any of them? Well, any with discrete Audio Clocks of suitable frequency.

You just need to remember to set your PC or player not to feed them anything else except 44.1KHz.



Why would it? Isolating I2S is trivial, given that most frequencies are quite low.



The AMR CD-77 CAN be used as Stand Alone DAC, so if I may be so bold, there is at least one.

Ciao T
Thanks but I am still not following. The USB2.0 asynch devices can't be isolated on the usb side even when running a 16/44.1 file, the required speed is still there independant of the audio, last I checked there were no 2.0 audioclass usb isolators.

Are you saying put the isolation on the clock? These almost all use 22.5792 mhz clocks for audio. We could put this clock at the DAC but what do you use to galvanically isolate going back to drive the usb chip ? I haven't seen a scheme for this sort of thing.


If someone has this working it would be quite nice I think and a boon for a lot of NOS tinkerers..
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Old 8th January 2012, 12:08 PM   #22
Previously: Kuei Yang Wang
 
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Hi,

Quote:
Originally Posted by regal View Post
Thanks but I am still not following. The USB2.0 asynch devices can't be isolated on the usb side even when running a 16/44.1 file, the required speed is still there independant of the audio, last I checked there were no 2.0 audioclass usb isolators.
Why do you keep going on about isolating USB?

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Originally Posted by regal View Post
Are you saying put the isolation on the clock?
Sure.

Quote:
Originally Posted by regal View Post
These almost all use 22.5792 mhz clocks for audio.
It varies, the XMOS reference design uses 11.XXX...

Quote:
Originally Posted by regal View Post
We could put this clock at the DAC but what do you use to galvanically isolate going back to drive the usb chip ? I haven't seen a scheme for this sort of thing.
Well, how else would you do it? The circuitry is so primitive, so trivial, hence no-one has seen the need to elaborate.

There are so many isolators available that work fine at these speeds, just pick one. Many are BTW available with three lines one direction (I2S) and one line into the other (MCK).

Ciao T
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Old 8th January 2012, 08:49 PM   #23
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Originally Posted by Joshua_G View Post
Is there any good TDA1541A DAC kit, on eBay or elsewhere?
This looks promising, and it has everything on a single PCB - good power supply, PCB layout looks good, it has NOS option, good I/V... I am very surprised that no one has mentioned this kit.... It seems like very good starting point, with all elements included -> so any further necessary tweaking could be easily executed. I always preferred “everything” on a single PCB, compared to 3, 4 or 5 separate modules that need to be connected together to get a fully working DAC.

The only thing that’s missing is USB (and TORX….)

Boky
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Old 8th January 2012, 09:15 PM   #24
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Originally Posted by Extreme_Boky View Post
This looks promising, and it has everything on a single PCB - good power supply, PCB layout looks good, it has NOS option, good I/V... I am very surprised that no one has mentioned this kit.... It seems like very good starting point, with all elements included -> so any further necessary tweaking could be easily executed. I always preferred “everything” on a single PCB, compared to 3, 4 or 5 separate modules that need to be connected together to get a fully working DAC.

The only thing that’s missing is USB (and TORX….)

Boky
Which kit are you referring to?
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Old 8th January 2012, 10:09 PM   #25
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I completely forgot the link....

DAC Kit WM8805 + TDA1541 2.0C parallel output OS/NOS | eBay

Boky
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Old 8th January 2012, 10:19 PM   #26
Previously: Kuei Yang Wang
 
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Hi,

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Originally Posted by Extreme_Boky View Post
On first looks - train wreck...

Ciao T
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Old 8th January 2012, 10:24 PM   #27
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This looks promising …
"Looks promising" is meaningless to me. I'm looking for a kit which is known to be of excellent results.
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Old 8th January 2012, 10:38 PM   #28
Cobra2 is offline Cobra2  Norway
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How cute, a chinese kit with filed off components... ouch!

Arne K
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Don't believe everything you think...
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Old 8th January 2012, 10:53 PM   #29
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Raindrop_hui is kown to be skittish with her designs. All in all they don't look like like a "trainwreck" to me. Could be better but could be worse too.
Sure, I am not fan of the discrete I/V stage or the NOS option or the LF351, but that's a different story.
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Old 9th January 2012, 12:27 AM   #30
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On first looks - train wreck...
That's what I was looking for all along…
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