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Old 20th September 2018, 03:14 AM   #2741
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Very little progress today, except LTC6655 soldered to small adapter board. Hope to start making good progress on AVCC board. Will post pictures when I have something to show. I will not get pushy about trying to get layout drawings out of people unless people say that want do any. Were we to have interest in that, I would be happy to accommodate and support however I can. If no interest, then I will just get on with it, I think. Want to keep progress happening in some way, and there wasn't any to speak of here today.
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Old 20th September 2018, 04:34 PM   #2742
terry22 is offline terry22
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Join Date: May 2017
Hi guys,
I am about to order an ak4137 to convert pcm signal to dsd256 to feed the 9038q2m board.
I just saw on ebay that there is different models with differents clocks.
Could you tell me which one is the better for what we are doing?

A Standard Edition Crystal Configuration 22.5792M 24.576M

B Low frequency version of the crystal configuration 11.2896M 12.288M

C 768K version of the crystal configuration 22.5972M 49.152M

AK4137 I2S/DSD Sample Rate Conversion Board Supports PCM/DSD Interchange | eBay

Thank you.
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Old 20th September 2018, 04:48 PM   #2743
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Hi terry22,

You could get A or C.

Have the A version here.

Have not tested version C, which gives highest PCM sample rate output (768k), but as a result doesn't allow for sample rate conversion to 48k PCM.

DSD sample rates are the same for both A and C.

Very low price here: AK4137 I2S/DSD Sample Rate Conversion Board Supports PCM/DSD Interchange Supports DOP Input for hifi amplificatore-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

Also, in the current descriptions of this board where it says: "NOTE: ...The DSD256 cannot be output. "

When I bought a board it said: "NOTE: ...DSD128 can't output DSD256. Because the output 768K signal needs to use a higher frequency crystal, the default output of this board is only 384K."

Last edited by Markw4; 20th September 2018 at 05:05 PM.
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Old 20th September 2018, 06:07 PM   #2744
terry22 is offline terry22
diyAudio Member
 
Join Date: May 2017
Quote:
Originally Posted by Markw4 View Post
Hi terry22,

You could get A or C.

Have the A version here.

Have not tested version C, which gives highest PCM sample rate output (768k), but as a result doesn't allow for sample rate conversion to 48k PCM.

DSD sample rates are the same for both A and C.

Very low price here: AK4137 I2S/DSD Sample Rate Conversion Board Supports PCM/DSD Interchange Supports DOP Input for hifi amplificatore-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

Also, in the current descriptions of this board where it says: "NOTE: ...The DSD256 cannot be output. "

When I bought a board it said: "NOTE: ...DSD128 can't output DSD256. Because the output 768K signal needs to use a higher frequency crystal, the default output of this board is only 384K."
Thank you mark, you're very helpfull as always.
If I understand it well, to output dsd256 I have to upsample all signal at least at 176.4K. Is that right?
(That is not a problem, I can upsample it in moode player using SOX)
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Old 20th September 2018, 07:07 PM   #2745
DRONE7 is offline DRONE7  New Zealand
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Join Date: Aug 2008
Quote:
Originally Posted by terry22 View Post
Thank you mark, you're very helpfull as always.
If I understand it well, to output dsd256 I have to upsample all signal at least at 176.4K. Is that right?
(That is not a problem, I can upsample it in moode player using SOX)


My board arrived late yesterday and with any luck I may find time to connect it today.

From what I read files at 44.1 to <176.4 can be converted by the board to DSD64 or DSD128.

Files from 176.4 up can be converted to DSD256
Files below 44.1 can't be converted to DSD at all.

Last edited by DRONE7; 20th September 2018 at 07:22 PM.
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Old 20th September 2018, 07:29 PM   #2746
terry22 is offline terry22
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Join Date: May 2017
Quote:
Originally Posted by DRONE7 View Post
My board arrived late yesterday and with any luck I may find time to connect it today.

From what I read files at 44.1 to <176.4 can be converted by the board to DSD64 or DSD128.

Files from 176.4 up can be converted to DSD256
Files below 44.1 can't be converted to DSD at all.
thanx
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Old 20th September 2018, 08:48 PM   #2747
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Both types of AK4137 boards here can convert 16/44 to 11.2MHz DSD, the highest DSD rate.

Just remember how to wire them up, which is a bit odd for the low cost AK4137 board. Pictures here: ES9038Q2M Board - Page 204 - diyAudio

Also, I added some extra ground pins to that board.

Last edited by Markw4; 20th September 2018 at 08:56 PM.
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Old 20th September 2018, 09:16 PM   #2748
DRONE7 is offline DRONE7  New Zealand
diyAudio Member
 
Join Date: Aug 2008
Quote:
Originally Posted by Markw4 View Post
Both types of AK4137 boards here can convert 16/44 to 11.2MHz DSD, the highest DSD rate.

Just remember how to wire them up, which is a bit odd for the low cost AK4137 board. Pictures here: ES9038Q2M Board - Page 204 - diyAudio

Also, I added some extra ground pins to that board.
Hi Mark, Terry, I've just connected the AK4137 and it works first time ootb...

For testing I'm using the "b" system of 'oh whoops so what' devices .
Moode Audio on raspberry Pi B (yes Terry, the single core B) > Xmos U8 > AK4137> Ebay 9018K2m dac.

Moode is playing webradio and output to usb ( no sox resampling) shows as."Encoded at: 32 bit, 44.1 kHz, Stereo, 2.822 mbps"

AK4137 shows input as I2S and output as DSD256. so confirms Marks comment above.

Later today I hope to connect the AK4137 into the main system and do some listening.

Mark, what was the digital filter setting you recommended for this board ?

Last edited by DRONE7; 20th September 2018 at 09:23 PM.
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Old 20th September 2018, 09:41 PM   #2749
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
I am using the ShortSharp filter. There are four to choose from and two of them cut a lot of HF out of the top of the audio band which I saw feeding them pink noise. So, there are two more or less flat filters to choose from. If your dac is modded enough I think ShortSharp will sound best and most accurate. If it sounds too bright or something then you probably still have some distortion to get rid of and or are missing some bass. Everything matters, including harmonic distortion compensation and DPLL bandwidth in the dac registers. Don't stop until you get to the end would be my advice. It is all doable. The pin lifting is not even a challenge, its easy and reliable with a little practice. Please lets talk if any qualms about doing any of the mods.

Last edited by Markw4; 20th September 2018 at 09:44 PM.
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Old 21st September 2018, 12:17 AM   #2750
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Starting to work on AVCC board layout. This time instead of paper, I needed to play around with the physical board and the major components. What I came up with is shown in the pictures below.

A red line across the edge of the board indicates the approximate area where the ground plane will be connected to the dac board ground plane. There are also a couple of smaller red marks showing where the 10uf film cap leads will go.

Ground plane will run on the solder side of the board again like we did with the output stage board. The ground plane will run underneath the film cap body, so ground plane needs to go in first with notches at the edge where the film cap leads go. There will also be some ground plane run around the edge of the board to fully surround the LTC6655 adapter board.

This time opamp electrolytic filter caps will be located at the sides of the opamp socket rather than off the ends. Thinking about some holes in the the ground plane for where the opamp 10uf input filter cap and 10k resistor get joined together. Also need to figure out what to do with creating the two Vref signals needed by the output stage. I sure would like to use SMD resistors for that, although metal film could be used too. Have to see what I have in stock because I don't want to place an order for just four resistors.

The AVCC board will be oriented with respect to the dac board such that the AVCC opamp pins point towards the 47uf AVCC filter caps in the dac board and also point at the output stage board. It will be located right next to the 47uf filter cap pins.
Attached Images
File Type: jpg AVCCstart_layout1.jpg (258.5 KB, 132 views)
File Type: jpg AVCCstart_layout2.jpg (233.1 KB, 138 views)
File Type: jpg AVCCstart_layout3.jpg (286.2 KB, 131 views)
File Type: jpg AVCCstart_layout4.jpg (324.4 KB, 134 views)

Last edited by Markw4; 21st September 2018 at 12:30 AM.
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