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Old 29th January 2010, 10:19 AM   #401
le´flu is offline le´flu  Germany
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Location: Hoexter
Hi to all,
thinking trough all the projekt and reading all the DacEnd
pages there are still a few questions:

@Quang Hao: To what idss should the sk170 in the salas-reg
be matched for best performance?

@andrea: will there be any changes in performance if one would
use 220R IV-Resistors instead 200R?
Do you suppose a sonically upgrade using the ll1660 transformers
in the dacend?
Would you recommend the lundahl digital input-transformer or
which one?

Greetings Ulf
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Old 29th January 2010, 02:10 PM   #402
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Hi!
@Quang Hao: To what idss should the sk170 in the salas-reg
be matched for best performance?

unnecessary matche 2sk17

@andrea: will there be any changes in performance if one would
use 220R IV-Resistors instead 200R?

It is ok you can you R 220 Ohm,

Do you suppose a sonically upgrade using the ll1660 transformers
in the dacend?
Yes, If you like that, so you can you digital input-transformer the sample
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Old 29th January 2010, 05:34 PM   #403
savvas is offline savvas  Greece
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First things first : a question any boards for full set left ? (been away for awhile)
I haven't read any impression of this implementation vs other AD1865.
For example Adrea did salas regs made some difference in overall performance. I was thinking powering an AD1865 with superegs (or salas) directly, again what are these 431s doing near the chip ?
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Old 29th January 2010, 08:06 PM   #404
hotzman is offline hotzman  Romania
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Hi Quanghao,
Can I register? I'm interested to buy 2(two)full set DacEnd.
I can already pay through Paypal?
Thank you!
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Old 29th January 2010, 08:28 PM   #405
vzs is offline vzs  Europe
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Quote:
Originally Posted by savvas View Post
First things first : a question any boards for full set left ? (been away for awhile)
I was thinking powering an AD1865 with superegs (or salas) directly, again what are these 431s doing near the chip ?
Good question, I myself thought why are they needed, so I presume these:
- for the analog part I could not find a good answer. One could try without them to see if there is any difference
- for the digital part the one that feeds the AD1865 might be good to separate from the digital voltage but a small 47uH coil as Andrea did might be enough as well

I think they are used for the sake of completeness but they could be left out if one dislikes them.

Last edited by vzs; 29th January 2010 at 08:37 PM.
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Old 29th January 2010, 11:08 PM   #406
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YES! the Salas shunt is very very exelent Power supply for DAC or Or any other pre or phono!!!

We use A little post shunt regulators using the TL431 has been inserted to separate all the power supply like suggested in the datasheet of AD1865 and CS8414. And the sound is better!

***I think they are used for the sake of completeness but they could be left out if one dislikes them***

That which is distinct from the other DAC!

You can se in the web: DAC End 2 - the AD1865N-K with single ended vacuum output stage
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Old 29th January 2010, 11:11 PM   #407
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Quote:
Originally Posted by hotzman View Post
Hi Quanghao,
Can I register? I'm interested to buy 2(two)full set DacEnd.
I can already pay through Paypal?
Thank you!
Yes! but you can wait me will make more some PCB.
now I only have the numbers you have for me please!
Quanghao
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Old 29th January 2010, 11:12 PM   #408
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Default 431s

Quote:
Originally Posted by savvas View Post
First things first : a question any boards for full set left ? (been away for awhile)
I haven't read any impression of this implementation vs other AD1865.
For example Adrea did salas regs made some difference in overall performance. I was thinking powering an AD1865 with superegs (or salas) directly, again what are these 431s doing near the chip ?
I have the same question regarding the use of shunt 431. According to Andrea's DAC Final Test page he states:

"The shunt regulator has been eliminated after the first 30 minutes because the sound was horrible using this and all the +5V has been generated from a single LT1085."

comment: the good LT1085 has a wider frequency response similar to LM317, never use 7805.

I would like to know why now are back again.

Last edited by apelizzo; 29th January 2010 at 11:18 PM.
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Old 30th January 2010, 05:05 AM   #409
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Some image ! i m doing make it!
Attached Images
File Type: jpg DAC1.jpg (388.1 KB, 398 views)
File Type: jpg IV.jpg (442.9 KB, 388 views)
File Type: jpg SALAS.jpg (420.4 KB, 372 views)
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Old 30th January 2010, 10:12 AM   #410
savvas is offline savvas  Greece
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Quote:
Originally Posted by quanghao View Post
Yes! but you can wait me will make more some PCB.
now I only have the numbers you have for me please!
Quanghao
So, we have to wait. Are you gonna take pre orders or wait till the new pcbs arrive ?

If I had my way I'd have these 431s and everything accompanying them taken out of the main board. Maybe an extra board. I know it's kind of fuss, all these extra cables but more freedom is accomplished this way.
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