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Old 22nd September 2018, 05:29 AM   #2771
DRONE7 is offline DRONE7  New Zealand
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Join Date: Aug 2008
Quote:
Originally Posted by Markw4 View Post
Suppose I make zip files containing instructions (including lo-res pics), BOM, schematic, hi-res pics, and layout diagram (if available) for the through hole component mods. The file size is going to much, much larger than what I can attach to a diyaudio post. (I can't even post one really hi-res pic.) Where would be a good place to host it so people can get it?
Hi Mark,
Dropbox works, or you could post the Hi-res to a photo hosting site like 'Flickr' or '500pix' or similar with free hosting then link here...and attach here the bom, layout, and schematic ...should fit fine..

cheers...bob
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Old 22nd September 2018, 03:04 PM   #2772
terry22 is offline terry22
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Join Date: May 2017
Quote:
Originally Posted by DRONE7 View Post
If you are not playing DSD files but simply using the AK4137 to upsample PCM to DSD then you shouldn't need a USB board at all.
Simply connect the I2S output from the Kali or Pi.
In fact there is a Pi Hat version of the AK4137 that I think does DSD file input too... (although it does not have the LCD display that the stand alone board has)
Raspi-4137 Raspberry Pi Digital Network Player Supports 32bit 384K DSD256 | eBay

I use both the basic XU8 usb to I2S (which is the previous series to the one you linked) and a DIYinHK XMOS XCORE-200 XU216 which is the series after your linked XU208
XMOS 384kHz DXD DSD256 high-quality USB to I2S/DSD/SPDIF PCB - DIYINHK
I have several different devices and O/S' and some, such as X86 PC's ,don't have I2S out. Thus the need for a usb interface.
I recall that Mark uses Windows PC so needs Usb to I2S too.

Thank you Drone,
Very clear.
As I have many DSD 64/128/256 files(for now played with DOP) I will go for xmos.
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Old 22nd September 2018, 11:21 PM   #2773
Markw4 is online now Markw4  United States
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Again, more pictures of the AVCC board coming together. Some of it is getting harder to see especially around the opamp socket where there are more wires now. I soldered on some leads to go the 47uf AVCC caps on the dac board and slipped wt/gn/yel sleeving over them for now. Big red and black wires are for +-15v. Decided to go ahead and use the 10k MF resistors I have in stock even though they are kind of big. It was either that or SMD and I decided to stick with the program. Thus, Vref dividers/filters are soldered in place. The opamp input filter is soldered in place. Getting pretty close to the end of the AVCC board.

Pictures below.

For tomorrow: No pictures of it yet, but right now working on attaching the AVCC board to the dac board. That may be hardest part of this whole thing, but it was all I could think of to use through hole components and put the AVCC board close to where AVCC voltages are needed. More on that later.
Attached Images
File Type: jpg Vref_divider2.jpg (67.5 KB, 247 views)
File Type: jpg AVCCwiredAll.jpg (127.9 KB, 249 views)
File Type: jpg AVCCwiredAll2.jpg (122.6 KB, 250 views)
File Type: jpg AVCCwiredAll3.jpg (109.1 KB, 242 views)
File Type: jpg AVCCwiredAll4.jpg (166.5 KB, 242 views)
File Type: jpg AVCCwiredAll5.jpg (130.1 KB, 56 views)
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Old 23rd September 2018, 08:52 PM   #2774
Markw4 is online now Markw4  United States
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Whew! No kidding, that last bit of AVCC board work was a bit nerve-racking, but it's done.
Pictures below. Green blobs at the outside corners of the AVCC board are classic green epoxy putty. AVCC board ground plane is soldered to dac board on both sides of AVCC board. I used SMD 47uf caps on the dac board, took off the plastic spacer on the bottom, and stuck the short, flat leads through the holes in dac board. One can see that where the ground lead is soldered to the dac board it is flat. Would have been fine if it was round too.

In one of the AVCC board pics, Vref attachment points are outlined in yellow, and the where +5v will connect to LTC6655 is outlined in red.

Some closeups are included of where AVCC power wires are soldered to the 47uf cap pins on the bottom of the dac board. Probably would have been easier if I had used caps with longer leads which could have been sticking out more for easy access, but it worked out okay. The AVCC power wires were stripped of insulation, and a bit of sleeving slipped over them to help keep them from shorting to anything they shouldn't. Thought that might be easier that trying to strip short pieces of small wire which can bring its own problems.

I'm sure there are other ways to do this and many variations that would be similar. The big film cap was hard to figure out what to do with and I'm not sure if I were to do this again if I would arrange the components exactly the way I did. I don't know if there is a best way in this case. It was thinking about ending up with something like this that convinced me I would prefer doing SMD AVCC power for the first board, which of course is what I did.

I also still think the AVCC board could have been done pretty much just as well from the side as I had originally planned. Only building both ways, from the side, and here in the middle, and comparing results would convince me one way might be better than the other.

On the other hand, the output stage for this version seems fine from a location perspective. It would be an easy place to do SMD or through hole. No real compelling reason to do the first board output stage the way I did except to keep all the mods compact and on a single piece of PCB material.

There is some more work to do to finish wiring up power and finding some place to put RCA analog output connectors since I already removed the original ones.

Also, at some point this board needs a clock upgrade and I2C bus connectivity mods. One thing at a time.
Attached Images
File Type: jpg AVCCgnd1.jpg (174.0 KB, 76 views)
File Type: jpg AVCCgnd2.jpg (204.2 KB, 71 views)
File Type: jpg AVCCtoDacBoard1.jpg (512.9 KB, 68 views)
File Type: jpg AVCCtoDacBoard2.jpg (486.1 KB, 58 views)

Last edited by Markw4; 23rd September 2018 at 09:05 PM.
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Old 24th September 2018, 09:02 PM   #2775
Markw4 is online now Markw4  United States
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An updated attempt and making an output stage instruction sheet is available here: Dropbox - Output Stage Instructions.zip

Persons interested in building the mod please take a look a let me know how close it is coming to making it possible for you to figure out how to make the output stage board.

So far as I am able to tell, it is not possible to make it a whole lot easier. At some point one will need to look at the schematic, layout drawing, and pictures to get an idea of how to proceed with soldering parts together. If the color coding in the last couple of images is helpful, I could possibly add it to the layout drawing as well, or you could. Whatever will help simplify the project from impossible to doable, if not necessarily simple.

Thx.
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Old 25th September 2018, 06:53 AM   #2776
Markw4 is online now Markw4  United States
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Quote:
Originally Posted by Markw4 View Post
An updated attempt and making an output stage instruction sheet is available here: Dropbox - Output Stage Instructions.zip
Anyone?
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Old 25th September 2018, 07:39 AM   #2777
eziitis is offline eziitis
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and how does it sound? perhaps some measurements also would help.

checked your LPF values on ES9028pro board. how did you calculate them?
with an AD797 I am getting -98db, but only with AD797...
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Old 25th September 2018, 08:18 AM   #2778
terry22 is offline terry22
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Join Date: May 2017
Quote:
Originally Posted by Markw4 View Post
Anyone?
Hi Mark.
I just look to your doc.
It looks ok for me to start.
I guess I will need help :-)) , but it's a go!
thank you

Do you have a definitive BOM to provide?
Or the one provided by bih ok?
https://www.diyaudio.com/forums/atta...utputstage-zip
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Old 25th September 2018, 09:07 AM   #2779
Markw4 is online now Markw4  United States
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Quote:
Originally Posted by terry22 View Post
The BOM bih made is good except for one part for the AVCC board. That part is the 47uf AVCC filter cap that goes in the dac board. He has it has being tantalum, but it should actually be aluminum electrolytic or aluminum organic polymer.
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Old 25th September 2018, 09:10 AM   #2780
Markw4 is online now Markw4  United States
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Quote:
Originally Posted by eziitis View Post
and how does it sound? perhaps some measurements also would help.

checked your LPF values on ES9028pro board. how did you calculate them?
with an AD797 I am getting -98db, but only with AD797...
How does what sound?

What ES9028PRO board?
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