DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 190 - diyAudio
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Old 17th June 2012, 11:55 PM   #1891
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Quote:
Originally Posted by truepaul View Post
Dario, did you try this out? If so, did 43 ohms prove to be the appropriate value for R401?
No, sorry, too busy with the My_Ref Fremen Edition project.

BTW I don't think it would improve things much.

That simple regulator is well suited for analog PS, I don't know if it fares well with digital.

PS

Caddock MK132 are costly, swapping a single 200R with two 100R...maybe it's better order them from PCX that has stock, isn't it?
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Old 18th June 2012, 09:39 PM   #1892
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Hi Dario,
Good thought on price ... yet I'm finding shipping costs keep adding up, as I go to different vendors to get just the right part -- (ebay, Mouser, Parts Connexion, Elfa Distrelec...). So far, almost 1/3 of my cost has been shipping (though this includes some upgrades to my workbench tools :-)

But my luck ... Mouser USA now stocks the 200 ohm Caddock !
Part 684-MK132V-200

Problem solved !! ;-) !!
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Old 18th June 2012, 10:16 PM   #1893
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Originally Posted by truepaul View Post
But my luck ... Mouser USA now stocks the 200 ohm Caddock !
Are you sure?

That code is also on my FE BOM and it's out of stock...
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Old 19th June 2012, 07:59 PM   #1894
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Default My mistake ... listed but not in stock

Ooops... my error !! They list it, but it's not in stock. On order, with estimated nine week lead time to get it.
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Old 19th June 2012, 11:40 PM   #1895
MelB is offline MelB  Canada
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Alrighty, I 've playing with the AK4396 Version. I put it in my Arcam Alpha 7. There is plenty of room. I am using the 15-0-15 0-9v transformer that you can get with these boards. I have configured the DAC output resistors for the AK4396. (2.4K and 150 ohm). Thanks Clave!
Using a value of 680pF for the DAC output filter seems kinda harsh and bright. I can quickly switch back and forth from the Arcam output to the AK4396 output.
The DAC output is filtered by this circuit:
Multiple Feedback Low-pass Filter Design Tool

So you can calculate the cutoff frequency at 177K. I saw some room to lower that!
I switched out the 680pF caps and now have 2.2nF polypropylene Panasonics in their place.
http://industrial.panasonic.com/www-...BD0000CE17.pdf
The cutoff frequency is down to 98K now but it sounds every bit as good as my Arcam.....even better bass!
Also I am using LM4562 opamp.
Other "improvements":
I am not using the rectifier bridges that came with it. I have made up bridges using 40v Schottky diodes to reduce switching noise.
6800uF 25V caps on the 15-0-15 line and a 10,000uf 16v on the 0-9v line. (They fit!)
Resistors on the DAC output are Carbon film.
2200uf 16v caps after the 12v regulators.
My 12v regulator really does not get that hot...maybe 45 degrees Celsius. (Could be the Schottky's?)
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Old 19th June 2012, 11:51 PM   #1896
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Quote:
Originally Posted by truepaul View Post
They list it, but it's not in stock.
See this post on the FE thread.

Quote:
Originally Posted by MelB View Post
I have configured the DAC output resistors for the AK4396. (2.4K and 150 ohm). Thanks Clave!
You're welcome

Quote:
Originally Posted by MelB View Post
Using a value of 680pF for the DAC output filter seems kinda harsh and bright.
(...)
The cutoff frequency is down to 98K now but it sounds every bit as good as my Arcam.....even better bass!
Also I am using LM4562 opamp.
The problem is not the filter but the LM4562, IMHO.

LM4562 has problems with capacitive loads and not that big output current.

So it can easily sound harsh and bright.

Isolating his output with a small value resistor could help a lot (see in the first pages of the thread).

The best solution would be to have a buffer after it or, easier, change opamp...

Quote:
Originally Posted by MelB View Post
Resistors on the DAC output are Carbon film.
Good choice.
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Old 20th June 2012, 12:14 AM   #1897
MelB is offline MelB  Canada
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I have some of these coming:
2* Dual SOIC to DIP-8 Convert PCB Adapter SMD OPA627 | eBay
and then I can try out my OPA827's. I ordered them not realizing they were NOT dual channel.
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Old 20th June 2012, 12:18 AM   #1898
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Quote:
Originally Posted by MelB View Post
I have some of these coming:
2* Dual SOIC to DIP-8 Convert PCB Adapter SMD OPA627 | eBay
and then I can try out my OPA827's. I ordered them not realizing they were NOT dual channel.
Maybe on BOM is not so clear but I've specified they must be mounted on a BrownDog adapter...

I lke best the ones from Cimarron but the ones you ordered should do as well.

OPA827 to give full potential should run for 50-100 hours (at first bass is not so controlled).

Burn-in can be greatly reduced using Isotek System Enhancer CD (2-3 runs of track 2 will do).
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Last edited by ClaveFremen; 20th June 2012 at 12:21 AM.
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Old 21st June 2012, 11:10 AM   #1899
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Hello Dario,

In your BOM you mention that a 7812 / 7819 should be used Why not 7815 / 7915?


Haik
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Old 21st June 2012, 01:16 PM   #1900
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Quote:
Originally Posted by haik View Post
In your BOM you mention that a 7812 / 7819 should be used Why not 7815 / 7915?
Simply to be coherent with original BOM.

In fact I'm using 15V ones in my DAC, obiously they should be On Semi ones.
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