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News: Dec. 31, 2012 : XXHighEnd + Phasure NOS1 DAC receive 6moons Blue Moon Award !
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 81 
 on: August 14, 2015, 04:02:12 pm 
Started by PeterSt - Last post by PeterSt
Times 2 for differential (my own Gerber issue), times 2 for 2 channels.

How many channels do you like to have, you said ??

swoon swoon swoon swoon swoon

 82 
 on: August 14, 2015, 02:57:36 pm 
Started by PeterSt - Last post by acg
Anthony,

Quote
Foil for about $15 each will make the dac very, very expensive, but perhaps they will be just what the doctor ordered!

Yes. And in the past month they became 30% more expensive (for us - EUR-USD).

And you know what the biggest problem is ?
Someone has to test this and see whether it's worth it.
Not even me is going to do that.

Regards,
Peter

28 bits x 3 resistors per bit (from photo - not sure if this is true) x $15 = $1260 per board.

 83 
 on: August 14, 2015, 02:40:37 pm 
Started by PeterSt - Last post by PeterSt
Anthony,

Quote
Foil for about $15 each will make the dac very, very expensive, but perhaps they will be just what the doctor ordered!

Yes. And in the past month they became 30% more expensive (for us - EUR-USD).

And you know what the biggest problem is ?
Someone has to test this and see whether it's worth it.
Not even me is going to do that.

Regards,
Peter

 84 
 on: August 14, 2015, 02:14:31 pm 
Started by PeterSt - Last post by acg

And thus we can choose the resistor we like, of the sound quality we like.


This is important.  Those Vishay Dales are expensive little fellows especially in the 0.1% variant and at the number you will probably buy them they are like 40c each.  But there are a number of good low noise resistors to choose from, so it will be interesting to see what you come up with.  Var-Z Foil for about $15 each will make the dac very, very expensive, but perhaps they will be just what the doctor ordered!

I know it is off topic but a similar things happened to me this week.  I sent some gerbers to China for some pcb's for the ATX Linear psu project and about 30 minutes after I got the email that they had been put into production I realised that I should have added a snubber in one of the power supply boards...oh well...at this stage I just want to get the thing working...I can fine-tune it later.

 85 
 on: August 14, 2015, 02:05:31 pm 
Started by PeterSt - Last post by acg

And thus we can choose the resistor we like, of the sound quality we like.


This is important.  Those Vishay Dales are expensive little fellows especially in the 0.1% variant and at the number you will probably buy them they are like 40c each.  But there are a number of good low noise resistors to choose from, so it will be interesting to see what you come up with.  Var-Z Foil for about $15 each will make the dac very, very expensive, but perhaps they will be just what the doctor ordered!

 86 
 on: August 14, 2015, 01:09:50 pm 
Started by PeterSt - Last post by PeterSt
Quote
The ladder module (the long board) can hold 28 bit modules.

And that is the problem ...
It should have been 56.

So I have a design for SE (Single Ended) ladders and I have a design for Differential ladders. The decision for which is a bit (haha) crazy and is all related to the output. For example, nice to have a diferential power amp, but with a SE source something has to make that "differential" (make two signals out of one). Or, nice to have a SE poweramp, but what to do with the differential source (combine two signals into one which is veeeeery expensive, because a waste).

So maybe 8 weeks ago the idea was "SE" again, and that's just in a folder on disk somewhere, in the midtst of all the other stuff.

Then the whole boatload was given to China for production and over there they did not understand some file. So I adjusted a few things and resent the file. Again they did not understand so I sent the original again but now with an additional description. Ah, now all was fine.
But the last time I picked the wrong folder ...
swoon
I only found out yesterday after everything arrived.

So yesterday I put the ladder board to an order again, with again the original file.
Most probably I will now get a complaint again, have to change stuff and ... hopefully I will not be sending the wrong files again.

So again two more weeks of waiting.

Peter

 87 
 on: August 14, 2015, 12:57:44 pm 
Started by PeterSt - Last post by PeterSt
Below you can see how the bit modules are supposed to attach.
Don't look at the values or "untightness". This is just experimenting with the attachment means and how/whether things fit as intended.
They do. Happy

So here you see three bits (one module for each) with only the "through hole" resistors soldered. You can see that the size of these resistors is ~ 2mm too large to fit really, but this is intentional. So now this size fits, but a smaller size fits just the same.

Under the resistors you see pads for SMD resistors. So instead of "through hole", the ladder resistors (and it is all about that, SQ wise) it can also be SMD.

And thus we can choose the resistor we like, of the sound quality we like.

The ladder module (the long board) can hold 28 bit modules. Or less - and again it is about what we like or what is useful. This is of course all to find out.

Peter



 88 
 on: August 13, 2015, 10:34:20 pm 
Started by PeterSt - Last post by acg

But there is a small problem ...
yes

Need a bigger case?

Looks rather good by the way.  Thanks for the update.

 89 
 on: August 13, 2015, 09:07:41 pm 
Started by christoffe - Last post by Jud

Esau, you certainly are correct there. That is, if you mean to say that what has been done to 10074 also must be done for RTM, officially.

Regards,
Peter

I have some small idea how busy you are, so I say this in a gently encouraging way and not to nag:  An "official" XXHE version for Win 10 RTM will be most welcome whenever you are able to do it.

 90 
 on: August 13, 2015, 06:21:12 pm 
Started by PeterSt - Last post by PeterSt

So, nothing happened eh ...

High Resolution link Phasure NOS2 01

The loose boards in the left are the Linear Power Supply (the part of it which goes in the external case) and the new design of the Power Amp (black). The Power Amp is optional per (max 72W RMS) channel.

What you see on the right hand side is a 50 pieces of "bit modules" (they are all connected together per the production means). They connect to the sides of the ladder boards, in parallel.
You see 8 ladders here, for 8 channels. 56 of the bit modules go on one ladder (2x 28 bits).

High Resolution link Phasure NOS2 02

High Resolution link Phasure NOS2 03

But there is a small problem ...
yes

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