[HeyManslowdown97]

Just looked up the ADA4637/ADA4637

Apparently there are two responses by AD: for the Opa627 and Opa637

Now it begs the question which is better and it’s the ADA4637’s gain raised up 6 db like with the Opa637???

If so it probably wouldn’t work for me since I listen mostly to DSD

 

[HeyManslowdown97]

No, the lpf opamps are the original ones.
My changes there are.
4 Nichicon Fine Gold in place of the 4 “uncertain” stock Nichicons
ADA4637 on the 3.5mm out, with 2 Audio Note 220uf 16V in place of the “uncertain” Silmic same value on the output.
In the other Zishan I have the same setup but with the 2x627 opamps instead of the 4637 (I prefer the 4637 by a fair margin: more clear, more detailed, still musical and with no sibilances.

Not sure what version you got of Zishan but many like mine has two “Fake” 470ufs and some have the 220ufs.

I ordered two Audio Notes with 470 ufs just hope they fit!

 

[HeyManslowdown97]

Considering using a Dongle to connect to DAC into a PC to see if can power and run software or Music Apps via the computer

If so I’ll probably do the same with the Motherboard research how it done and see if I can modify the firmware if it’s “protected” at least I know I can the DAC can work on ANY semiconductor as long as it meets the spec requirements.

Next, I’ll just go on a diy forum and ask annoying questions on how I can put an Octa Core Scheme to the DAC.

The dongle is good and cheap way to see if actually could be done!

Then ill decide what operational system. Linux sounds like a good choice.

 

[kookaudio]

Not sure what version you got of Zishan but many like mine has two “Fake” 470ufs and some have the 220ufs.

I ordered two Audio Notes with 470 ufs just hope they fit!

You will have a hard time making them fit there, maybe you find a way.

 

[HeyManslowdown97]

You will have a hard time making them fit there, maybe you find a way.

Well maybe I’ll push one them in through the hole in the board and keep other one’s connection wire slightly longer for more pull and leeway going vertical. It’s not “ideal” but workable.

I always buy several extra for other projects or in cases like this

Mine I don’t believe isn’t 16v it’s less so maybe the cans are smaller in dimensions. I’ll have to check. It’s weird with sizes it would nice if suppliers would show actual sizes.

(In such case it would be nice to know how to use software to design the stuff since they can simulate a Trillion options at your finger tips)

*Note to Self* Use a rule when upgrading and and compare sizes to the parts you are buying!

 

[kookaudio]

Well maybe I’ll push one them in through the hole in the board and keep other one’s connection wire slightly longer for more pull and leeway going vertical. It’s not “ideal” but workable.

I always buy several extra for other projects or in cases like this

Mine I don’t believe isn’t 16v it’s less so maybe the cans are smaller in dimensions. I’ll have to check. It’s weird with sizes it would nice if suppliers would show actual sizes.

(In such case it would be nice to know how to use software to design the stuff since they can simulate a Trillion options at your finger tips)

*Note to Self* Use a rule when upgrading and and compare sizes to the parts you are buying!

Where did you get them? They usually write the dimensions...

 

[HeyManslowdown97]

Where did you get them? They usually write the dimensions...

Impulse buy sure they did and I didn’t bother because someome posted the link on this thread. It’s all good. If it don’t fit, I won’t go it to waste so it isn’t the end of the world

 

[Merlin-PT]

For people that don't have the tools to desolder those op275, does it make any sense to bypass them? I mean keep using them for 2.5 output, but remove the circuit connection to the socket opamp input and get 4 wires from the 4 "audio input caps" to the socket opamp input.
Will lose 2x amp from op275, but some are using very good opamps in the socket, I wonder if this is doable or any good?

I did this, bypass the LPF and went from the DAC to the socket opamp.
Why? Because I want to try all my socket opamps, to find the best one for LPF, the sound signature is the same that I have when soldering them in LFP, but now I have a socket to fast switch between them and only need 1 opamp.
This is temporary, it's just to try different opamps without buying and soldering 2x of them in each test.
I know it's not exactly the same, but gives me a very good ideia of the sound signature I will have in LPF. The ones I already tried in LFP, also have the same sound signature in the socket.

 

[DBaldock9]

One of these enclosures -

https://www.aliexpress.com/item/1-p...closures-diy-instrument-case/32601934225.html

- would hold this STM32F469I-DISCO discovery board, which has a 4" (800x480) Color LCD Touch Screen, and I2S bus (streams data to the AK4497) -

https://www.mouser.com/ProductDetail/STMicroelectronics/STM32F469I-DISCO?qs=kWQV1gtkNndotCjy2DKZ4w==

- along with an appropriate Battery / Power Supply circuit, and a modified DAC / Analog board from the DSD, should be able to provide an "enhanced" DSD.

I haven't read all about the stock software that runs on the card - but, as a development board, it should be possible to create an updated / better Music Player program.

 

[HeyManslowdown97]

One of these enclosures -

https://www.aliexpress.com/item/1-p...closures-diy-instrument-case/32601934225.html

- would hold this STM32F469I-DISCO discovery board, which has a 4" (800x480) Color LCD Touch Screen, and I2S bus (streams data to the AK4497) -

https://www.mouser.com/ProductDetail/STMicroelectronics/STM32F469I-DISCO?qs=kWQV1gtkNndotCjy2DKZ4w==

- along with an appropriate Battery / Power Supply circuit, and a modified DAC / Analog board from the DSD, should be able to provide an "enhanced" DSD.

I haven't read all about the stock software that runs on the card - but, as a development board, it should be possible to create an updated / better Music Player program.[/QUOTE

 

[HeyManslowdown97]

Great work! I thought about taking the STEM Out and replacing it but this could be a better option.

Then designing a brand new board schemed like a Zishan but trying it on an existing one.

The MOST expensive thing would be a the Ak4497 chip ($52us)

 

[HeyManslowdown97]

Would be cool if you can put Volumio on the development Board?

https://volumio.org/get-started/

 

[DBaldock9]

Great work! I thought about taking the STEM Out and replacing it but this could be a better option.

Then designing a brand new board schemed like a Zishan but trying it on an existing one.

The MOST expensive thing would be a the Ak4497 chip ($52us)

The STM32 development board is $62.50.
Sparkos SS3602 discrete op-amps are $83.00 each (including shipping).
Burson V6 Vivid or Classic discrete op-amps are $145.00 per pair (including shipping).

 

[countryboyhk]

Just got the new AK4493 version of Z3 from the famous Taobao of China , which costs about $4 more than the original AK4490 Z3. My old Z3's PO had been broken with single channel sound out after a year use. Been trying Hiby R3 & M0, I think Z3 is still the best valued mini DAP, so I want to give it a second chance.

Their built-up are almost the same with different DAC use ( I made myself a hi-res Z3 / 4490 with a sticker ). Instead of AK4493, they printed "AK449x" at the back, in case they can change different DAC in future

For the PCB of AK4493 Z3 ( muses02 installed )

About the sound, I think the AK4493 Z3 has more refined sound, more details on background music, with a little bit uplifting in high. It's not a huge upgrade from the original version. So, I suggest to keep the original Z3, and no need to rush for the new version. Anyway, I feel satisfied with the AK4493 Z3, and its worth to pay the extra.

 

[HeyManslowdown97]

The STM32 development board is $62.50.
Sparkos SS3602 discrete op-amps are $83.00 each (including shipping).
Burson V6 Vivid or Classic discrete op-amps are $145.00 per pair (including shipping).

Here’s a nice little introduction to the STM32 board. It’s pretty versatile.

How would you connect the DAC to it though?

Also it has an HDMI output so I’m guessing you have the option of an line out DSD stream via HDMI???