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Dual Mono DAC AK4490/AK4497
Dual Mono DAC AK4490/AK4497
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Old 30th September 2017, 09:43 PM   #391
pistollero is offline pistollero  Portugal
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Join Date: Apr 2016
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Quote:
Originally Posted by themystical View Post
I managed to get sound of the board with the Amanero using your sequence thanks very much. Its all a bit finicky tbh and the SQ using the whole board as designed including the opamps in the output stage is a step below my dual mono AK4490 set-up using DIYinHK boards.
What caps are you using on the dual mono ak4490 diynhk boards?
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Old 30th September 2017, 09:51 PM   #392
themystical is offline themystical  United Kingdom
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Quote:
Originally Posted by pistollero View Post
What caps are you using on the dual mono ak4490 diynhk boards?


The DIYinHK boards use the Panasonic FR series that come with the board as part of the kit. Nothing more fancy. I have yet to hear any audible difference in sound using different makes of capacitors in the power circuits of any piece of audio equipment tbh.
However, There is a big jump in SQ going from 5V to around 7V on the AK4490 boards as I have posted in this thread before.
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Old 30th January 2018, 11:11 AM   #393
fojica is offline fojica  Romania
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Join Date: Nov 2007
Quote:
Originally Posted by androa76 View Post
Install another 3.3v reg and supply separately VDIG and VAN 3.3v supply. Desolder ferrite choke. Because dig line is very noisy on scope and noise goes into analog supply line.Use low esr cap 47-100uf on VD 3.3V
Instal 100uh choke between Tps7a4700 and dac on +5v. That should relaxed sharp sound...
First of all, I want to thank you Androa. The mods that you posted really helped.
I have dual AK4490 + AK4118 board, no USB card. No filters selection - at least I couldn't figure out how to do it (without re-writing the firmware of MCU, which is sm8952ac25pp).
There are 2 x LT1963-3.3 -> one is used for DAC's (DVDD + AVDD) + Ak4118 and the second one was supposedly used for USB - so doing nothing since there is no USB.
I decided to use the second LT1963-3.3 for AVDD - both AK4490 and AK4118.
So I de-soldered the ferrite on AVDD for AK4490 and put a 100uH choke, with 22uF before (from LT1963 regulator) and 100uF Nichicon FG after it (to AK4490). Splitting the 3.3V supply but without the choke (with original ferrite) leaded to some kind of sharp/edge sound. Most obvious on voices, which became a bit harsh. Adding the choke had some "calm" effect, much better.
Also AK4118 has separate DVDD and AVDD pins which obviously are connected together - so i cut the trace to AVDD and routed it with AVDD from AK4490's to the second LT1963. More relaxed sound and clearly better 3D soundstage. Added also an 100uH choke on AVDD here, 10uF before (from regulator) and 220uF Nichicon FG after the choke. Increasing the cap size after the choke (the FG) to 220uF leaded to an increase in soundstage/"air".
Also on AK4490 DAC's the VCOML and VCOMR caps size had some influence - with 47uF there seems to be more "weight" to the sound, maybe a little increase in the mid-bass region that explain this effect. With 10uF is more "tiny" sounding. So a 22uF could be tried (not done yet).
Hope this helps DIY'ers around.

Tibi
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Old 13th February 2018, 07:50 PM   #394
Detectit1 is offline Detectit1
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Join Date: Jan 2018
@dimdim

I was reading your blog. And wow that TFT screen looks so awesome and professional. Great job!!!
Definitely want to try.... When I am ready to built my first DAC.

Last edited by Detectit1; 13th February 2018 at 08:02 PM.
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Old 14th February 2018, 12:11 PM   #395
Detectit1 is offline Detectit1
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Join Date: Jan 2018
Noob question.... Ready to buy my first diy dac. At Diyinhk.com

Can someone explain why the Diyinhk board with ak4497 chip is 110 dollar expensive? Than a board without dac chip?

Those no dac chip boards are delivered with through hole components right?

Otherwise crazy price difference.
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Old 14th February 2018, 12:56 PM   #396
Dimdim is offline Dimdim  Greece
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Join Date: Sep 2008
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Dual Mono DAC AK4490/AK4497
The ak4497 chip is indeed pretty pricey at around 45-50€, but I agree that diyinhk is charging a lot for just soldering it to the board.

Perhaps for a first dac build you should go for something less expensive..
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Old 8th May 2018, 11:15 AM   #397
tony71 is offline tony71  Netherlands
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Join Date: Apr 2006
Location: Zuidland, The Netherlands
Default Changing hardware mode to software mode on dual AK4497 dac possible?

Hello,

I have bought my second AK4497 dac from China.
The fist one was a single version, with software mode and the posibility of the 6 digital filters.

The second one i am using now, is a dual AK4497 version in hardware mode.
There is no option for the digital filters on this unit.
I know settings can be changed on the chip.

Is it possible to change this in some way? Can i buy a usb to i2c adapter and use a virtual com port on the pc?
Can i change the needed settings on the chip? Is that even possible or should the board layout also be changed?



Toni

Last edited by tony71; 8th May 2018 at 11:23 AM.
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Old 8th May 2018, 11:45 AM   #398
phase is offline phase  United States
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Join Date: Oct 2004
There are some options in hardware mode, search for eBay dac with ak4495 and there are some settings shown in that thread. Is a matter of selecting which pins are either pulled up to dvdd or to ground.
However, the consensus was that there was little difference between the various settings.
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