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Old 6th August 2006, 01:21 PM   #1
PsykoK is offline PsykoK  France
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Default An other Xono

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:
Click the image to open in full size.


A 3d view of the PCB:
Click the image to open in full size.


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


Regards,


Alex
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Old 6th August 2006, 03:05 PM   #2
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Great job, Alex.
Mind posting the schematic?
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Old 6th August 2006, 09:51 PM   #3
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Post An other Xono

Hi PsykoK

Very nice pcb layout. Good job!

But I would like ask you about the exchange between IRFs and ZVNs mosfets that you made on your circuit.

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



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Old 6th August 2006, 10:32 PM   #4
PsykoK is offline PsykoK  France
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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
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Old 20th November 2006, 08:17 PM   #5
roger-k is offline roger-k  Norway
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Great job!
What program do you use to draw 3D?
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Old 20th November 2006, 09:13 PM   #6
PsykoK is offline PsykoK  France
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Hi roger,

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


Regards,

Alex
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Old 11th April 2007, 11:45 AM   #7
PsykoK is offline PsykoK  France
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Default Up and running :D

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 :
Click the image to open in full size.
Click the image to open in full size.


I took more than 9H to finish this PCB :
Click the image to open in full size.

For the PSU board it was quite faster, less than 1H:
Click the image to open in full size.


After having checked all important points, I performed the last week a real test with some measurements.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

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)
Click the image to open in full size.

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
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