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Old 21st February 2003, 11:27 PM   #1
Cobra2 is offline Cobra2  Norway
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Default M-Audio SuperDac

Tried to reply to the AD1955 or CS43122 compared to PCM1704 and AD1862 tread...but it did not work..?

I have tried some of the "usual" mods to this unit:
1: Tantal-cap 4.7uF
2: OsCon 47uF(had one...)
3: Tantal 10uF
4: DAC analog supply caps 56uF Elna
5: DC-block-caps: Bi-pol 47uF bypassed w. 470nF
6: Op-Amps OPA627 (Bal-out) AD825 (RCA)
7: Extra filter for DAC Analog supply
8: RCA-connectors
---------------------------------
To come: PSU-upgrade including caps....
---------------------------------
Have tested between every change. Steps 1-4 did only give small changes, 5 was a great leap, step 6 was ofcourse even better....
---------------------------------
Please tell me where to implement a separate CLOCK..?
---------------------------------
Arne K
Norway
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Old 22nd February 2003, 09:57 AM   #2
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Default Re: M-Audio SuperDac

To come: PSU-upgrade including caps....
---------------------------------
Have tested between every change. Steps 1-4 did only give small changes, 5 was a great leap, step 6 was ofcourse even better....
---------------------------------
Please tell me where to implement a separate CLOCK..?
---------------------------------
Arne K
Norway [/B][/QUOTE]
--------------------------------

Use a separate beefy transformer and this has a big improvement.

You should also improve the filter network with all those cheap ceramic and mf resistors.
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Old 16th October 2003, 07:01 PM   #3
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Default New tweaks...:

Having read somewhere on the web-pages at TAG McLaren, they had a upgarde service for some product changing the AK4393 DAC-chip with AK4395, I decided to try the same!

Have also done a little re-routing of the error-detection on the CS8414.
And new analog filter-caps.

So far I'm pleased, but hardly worth the $$ (?).

Arne K
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Old 16th October 2003, 07:03 PM   #4
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Cool For the brave...

The DAC-chip;

Arne K
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Old 17th October 2003, 05:10 PM   #5
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Question Clock

Hi Arne,
Is there a clock on board? I don't see a crystal.
Maybe the DAC and digital filter can run on a asynchronous (stand alone) clock.
You have to dig into the datsheets. Some Delta-Sigma DACs have this feature.
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Old 17th October 2003, 05:17 PM   #6
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I'll guess that the reciever produces the clock signal. The AK4393 has internal digital filters which every(?) delta sigma DAC have.
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Old 17th October 2003, 05:21 PM   #7
Cobra2 is offline Cobra2  Norway
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No onboard clock...
BTW, have 8 x AK4395 for trade / sale...

Arne K
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Old 18th October 2003, 01:03 PM   #8
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Lightbulb Clock Synchronization

Hi Arne,
Maybe this thread answers your questions:
http://db.audioasylum.com/cgi/m.pl?f...sigma&session=
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Old 18th October 2003, 01:45 PM   #9
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Default Some answers, some (new) questions...

And getting into I2S seems more and more interesting...
Maybe next tweak?

Arne K
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Old 18th October 2003, 02:39 PM   #10
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Hi,

The AK4393 as well as the AK4395 can spit out 4V_pp into 600 ohms directly. Anyone considered removing all the op-amps and using passive 50 kHz low pass filters? No need for + and – 15V anymore then.

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