An other Xono

[PsykoK]

Hi all,

After one year of hard working I have only finished my Xono design this week.
I have made some modifications between my design and the original design of the Pass Labs.

First I added a dedicated regulation for each stage.
For the MC stage, I remove the 26V reg and replaced it directly with the same reg that I used for the other stage.


All IRF610/IRF9610 mosfet have been replaced with ZVN3306/ZVP3306 due to their high audio quality!
A friend helps me to make all adjustments to do this trick. We have to make some tests in physical condition to validate this modification.

For the PCB design I fixed some constraint, the most important was to assign all signal wire on the bottom face and the power wire on the top.



The PCb way design under Eagle:



A 3d view of the PCB:



Next step is to produce this PCB ad to build the first prototype :d


Regards,


Alex

[Holger Barske]

Great job, Alex.
Mind posting the schematic?

[EDDELARUE]

Hi PsykoK

Very nice pcb layout. Good job!

But I would like ask you about the exchange between IRF´s and ZVN´s mosfets that you made on your circuit.

Don´t you think that modification may brings the sound of your circuit different from the world AWARNED original Xono Pass Labs ??

[PsykoK]

Hi,

here all shematic:
Positive regulation
Negative regulation
Xono main

EDDELARUE>
For answering your question , yes it's a possibility that changing mosfet's affect the sound of the xono.
But I don't think that this will produce a worse result.

In any way, I newer had the chance to listen a real Xono form NP.
Otherwise I changed a lot of little things of the original shematic, so I don't know if mosfet's are the only factor who will change something.

I am trustful enough for the result.
The next stages will give us the response to all that .

Wait and see ......



Regards,



Alex

[roger-k]

Great job!
What program do you use to draw 3D?

[PsykoK]

Hi roger,

I use Eagle3d:
http://www.matwei.de/doku.php?id=en:eagle3d:eagle3d


Regards,

Alex

[PsykoK]

Hi all,

Some news from my XOno.
Now I'm happy because I can say that I have a working xono at home

The main PCB comes from www.eurocircuits.com :




I took more than 9H to finish this PCB :


For the PSU board it was quite faster, less than 1H:



After having checked all important points, I performed the last week a real test with some measurements.




I made all my measurements with a signal generator and an oscilloscope.
The input signal was a sinusoidal one with 20mVpp@1.1KHz.
Of the following pic you can see the result (the small signal is the impute and the big one the output)


To resume, we have an input signal with 0.20mVpp@1.1KHz and an output signal with 2Vpp.
So the gain is approximately of 60dB for the MM stage.

Otherwise this Xono sound very good: a lot of details, a very good dynamic and a large and deep scene.
It is not 100x better that my Grado PH1 but the sound is clearly and definitively better.


Again thanks to NP for this very nice schema




Regards,


Alex