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AK4490 USB Dac with dsd support.

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#522
This is the last stable version.

The is small pops, but it is not possible to get rid of them. The is a small DC value on the output of the DAC in order of +/-20mV.

The we mute the DC falls to 0mVdc. This shift generates a small click.

in the case of exit from DoP there is a larger "pop". It is not a problem at normal listening level. Remember that Mike runs the DAC directly into the Power amp without any attenuation at all. He has no volume control at all in between them.

I will continously update the firmware. So any new fix will be posted here.

BR

Sonny
 

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#529
sonnya said:
This is the last stable version.



The is small pops, but it is not possible to get rid of them. The is a small DC value on the output of the DAC in order of +/-20mV.



The we mute the DC falls to 0mVdc. This shift generates a small click.



in the case of exit from DoP there is a larger "pop". It is not a problem at normal listening level. Remember that Mike runs the DAC directly into the Power amp without any attenuation at all. He has no volume control at all in between them.



I will continously update the firmware. So any new fix will be posted here.



BR



Sonny
Click to expand...


Hi Sonny,

The DSD 64 is working now in native DSD. Great job. But I'm still getting the big pop whenever each track is selected with native DSD. I get the small click followed by the big pop right after. So perhaps the timing is off on when the switch engages. But good news is the click is before the pop so it shouldn't be because the switch is too slow.
 
Last edited:
#531
sonnya said:
I will look into it. Can the software generate an silence before playing the file? ..
I have put In an delay before releasing mute... But Maybe it is long enough on the native part.


Sent from my iPhone using Tapatalk
Click to expand...


With SDMdirect on HQplayer, there's not much you can do. I have the buffer time set to a Mac 250ms. It's as good as it will get.

The DoP delay is timed right. The click probably isn't too bad with DoP if you had an analog volume control with the volume turned down when selecting tracks.
 
#537
Preamp hooked up! Needs burn in. I'll share impressions in a few days.

20feb83ddd829b528766aa02d9713fd8.jpg
 
#538
Here's my implementation so far!

2015-11-20%25252021.40.33.jpg


There will be a shield added all around the preamplifier and DAC to keep AC leakage away as much as possible from the preamplifier and same for PSUs and headphone amplifier. I will have to machine the front panel to fit the LCD later on and all the necessary buttons and switches that goes along. I will also integrate a Raspberry Pi II in the setup.

Stay tuned!

Do
 
#539
pinnocchio said:
Here's my implementation so far!



2015-11-20%25252021.40.33.jpg




There will be a shield added all around the preamplifier and DAC to keep AC leakage away as much as possible from the preamplifier and same for PSUs and headphone amplifier. I will have to machine the front panel to fit the LCD later on and all the necessary buttons and switches that goes along. I will also integrate a Raspberry Pi II in the setup.



Stay tuned!



Do
Click to expand...


Nice! A little cleaner than my layout so far! 🙂
 
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