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Dual Mono DAC AK4490/AK4497
Dual Mono DAC AK4490/AK4497
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Old 13th July 2017, 05:35 PM   #341
Dimdim is offline Dimdim  Greece
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Dual Mono DAC AK4490/AK4497
Before we designed the dual mono board we did a test board with a single 4490, just to make sure that the design would work. That's the one shown on my blog.

A full presentation of the dual mono version with the accompanying arduino code is on my to-do list.. I'm waiting on a new set of controller PCBs, so as to do a full presentation. These boards are useless without an Arduino (or similar) controller.
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Old 15th July 2017, 06:38 PM   #342
nounouchet is offline nounouchet  France
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Dual Mono DAC AK4490/AK4497
Ok
I am waiting for your presentation.
Is there a real sound difference between single and dual mono ak4490 solution ?
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Old 15th July 2017, 10:54 PM   #343
Dimdim is offline Dimdim  Greece
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Dual Mono DAC AK4490/AK4497
That is really hard to tell, since my two test platforms are very different (different power supplies, different clocking setup, reclocking vs. no reclocking, different layout, 4-layer vs. 2-layer boards, and of course, different analog stages).

What I know for sure is that my dual 4490 setup as-is sounds a lot better than my single 4490 test board as-is, but that really does not mean a lot.
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Old 17th July 2017, 12:21 PM   #344
nounouchet is offline nounouchet  France
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Dual Mono DAC AK4490/AK4497
Considering the price of the chip, do not be embarrassed !
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Old 17th July 2017, 12:52 PM   #345
Dimdim is offline Dimdim  Greece
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Dual Mono DAC AK4490/AK4497
The price of the DAC chip is the least of our "problems" in these implementations.. the more expensive parts are the clock and the power supplies. Plus the output stages... But mostly the power supplies.
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Old 17th July 2017, 01:20 PM   #346
nounouchet is offline nounouchet  France
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it's what i mean...
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Old 25th July 2017, 12:14 PM   #347
iggy111 is offline iggy111  Croatia
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Hi guys, trying to upgrade the output section for AK4490 (diyinhk) dac. I use LME49720 now but want to try Sparkos discrete dual op-amps or transformers, but with transformers I don't know where to start. Any advice? Which trafo should I get, and which step-up ratio should I aim for?
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Old 25th July 2017, 08:15 PM   #348
UnixMan is offline UnixMan  Italy
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Quote:
Originally Posted by iggy111 View Post
I use LME49720 now ...
try ADA4627 ... much better.

@Dimdim: thanks a lot for your efforts!
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Old 25th July 2017, 08:59 PM   #349
Ryssen is online now Ryssen  Sweden
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Quote:
and which step-up ratio should I aim for?
1:1
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Old 27th July 2017, 09:40 AM   #350
iggy111 is offline iggy111  Croatia
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Don't want to hijack the current thread, I'll post my findings about transformers and discrete output sections when I have something to share

@UnixMan will try ADA4627 if I get my hands on it
@Ryssen thanks, I'll go read some more now
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