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Chinese AK4497 DAC dual-chip decoder board
Chinese AK4497 DAC dual-chip decoder board
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Old 3rd February 2018, 10:59 AM   #31
zenelectro is offline zenelectro  Australia
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Here's the original USB bridge
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Old 3rd February 2018, 01:21 PM   #32
dch53 is offline dch53  Australia
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Quote:
Originally Posted by zenelectro View Post
Here's the original USB bridge
I've found this one that looks just like yours: Free ship K.GuSS XMOS U8 Digital audio USB Daughter Card Support 32BIT Free Shipping-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

Have you wired the pins vertically? i.e. from the holes on the USB card to the holes on the DAC card directly underneath? If you can confirm, I'll order one.

Interestingly, I found this one that also looks like yours: NEW Breeze Audio XMOS U8 Digital audio USB Daughter Card Support 32BIT Free Shipping-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

on which the holes near the edge have the same labels as all the other cards and the hole in the middle is labelled "Coax".
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Old 3rd February 2018, 04:45 PM   #33
androa76 is offline androa76  Slovenia
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If you want help please make a photo of your bottom side of a board near that pin not top. Here is impossible to see where it is connected to.
Coax means spdif out signal ...
Both usb card up are the right ones.

Last edited by androa76; 3rd February 2018 at 04:49 PM.
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Old 4th February 2018, 03:21 AM   #34
zenelectro is offline zenelectro  Australia
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Quote:
Originally Posted by dch53 View Post
I've found this one that looks just like yours:

Have you wired the pins vertically? i.e. from the holes on the USB card to the holes on the DAC card directly underneath? If you can confirm, I'll order one.
As stated, I don't own one myself. None of the vendors could give me a guarantee it would work at DSD256 with appropriate USB bridge.

That 'extra' pin is coming from the clocks by the look of it.

T
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Old 4th February 2018, 08:05 AM   #35
dch53 is offline dch53  Australia
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Quote:
Originally Posted by androa76 View Post
If you want help please make a photo of your bottom side of a board near that pin not top. Here is impossible to see where it is connected to.
Coax means spdif out signal ...
Both usb card up are the right ones.
Hi,

Images attached.

IMG_0081.jpg

IMG_0083.jpg
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Old 4th February 2018, 07:37 PM   #36
androa76 is offline androa76  Slovenia
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Black board bigger picture to see where middle pin is connected to.
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Old 4th February 2018, 11:29 PM   #37
dch53 is offline dch53  Australia
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A photo isn't going to show that to you. There's a heavy black coating on the board which pretty much obscures all the tracks. I'm also starting to damage the plastic threads on the sockets from removing and refitting the board to the chassis.

I'll order the recommended board and be done with it.
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Old 5th February 2018, 12:44 AM   #38
zenelectro is offline zenelectro  Australia
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Quote:
Originally Posted by dch53 View Post
A photo isn't going to show that to you. There's a heavy black coating on the board which pretty much obscures all the tracks. I'm also starting to damage the plastic threads on the sockets from removing and refitting the board to the chassis.

I'll order the recommended board and be done with it.
A couple of points:

- Yes I would get hold of the recommended board, at this stage it's a good option for you to a/ see if it works and b/ scope out the various dig IP's.

- WRT that trace under board, yes it's covered but you can easily see where it's going and that is what you are after, it's destination which you haven't shown.

- From the link you previously posted Libera la nave K. GuSS XMOS U8 Digital audio Scheda Figlia USB Supporto 32BIT Trasporto Libero in Libera la nave K. GuSS XMOS U8 Digital audio Scheda Figlia USB Supporto 32BIT Trasporto Liberoda Amplificatore su AliExpress.com | Gruppo Alibaba

At bottom of page there is a PCB layout. You can trace this unknown OP signal from clocks. There are 2 NC7SZ152 multiplexors. The first switches between 2 clocks (22.xx 24.xx) to supply MCLK. The second switches between that MCLK and something else and goes through attenuator network to your 'mystery pin'.

I would be demanding some information from vendor WRT compatability with Amanero and exactly what this OP from USB board is.

cheers

Terry
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Old 5th February 2018, 03:56 AM   #39
dch53 is offline dch53  Australia
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Quote:
Originally Posted by zenelectro View Post
A couple of points:

- Yes I would get hold of the recommended board, at this stage it's a good option for you to a/ see if it works and b/ scope out the various dig IP's.

- WRT that trace under board, yes it's covered but you can easily see where it's going and that is what you are after, it's destination which you haven't shown.

I would be demanding some information from vendor WRT compatibility with Amanero and exactly what this OP from USB board is.

Terry
Thanks Terry. I've ordered the recommended board.

I'm still waiting on a reply from the DAC board vendor.

As for where the mystery hole on the DAC board goes, it goes to pin 1 of an AKM AK4118AEQ IC. This pin is labelled IPS0/RX4 which is 1 of 8 inputs to an 8 to 3 input selector. What does that tell you?

Thanks, Dave.
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Old 13th February 2018, 09:55 AM   #40
Detectit1 is offline Detectit1
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As I am also looking into a new DAC board. Es9038 or Ak4497. I see the PCB layout is exactly the same as the ESS pcb.
I also see in the description of the advertisement that volume control is not visible and anything above 192 kHz it won't display.

It looks more or less like a fast ess to AK conversion board. With flaws.

I am still not confident to buy one of those black pcb boards....
Those blue pcb ak4497 especially stating "don't be fooled real native DSD and not Dop"
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Last edited by Detectit1; 13th February 2018 at 10:03 AM.
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