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Old 22nd April 2013, 11:45 AM   #1431
Bemused is offline Bemused  United Kingdom
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Quote:
Originally Posted by EUVL View Post
Sen with cascode on all the JFETs.


Patrick
Dear Patrick, any chance of a schematic for those of us that are not EEs

Regards
Tony
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Old 2nd May 2013, 07:31 PM   #1432
CeeVee is offline CeeVee  Portugal
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Default CeeVee in SEN heaven

First and foremost...a huge thank you to Patrick.

This is a gorgeous IV ...never had such crystal clear, dynamic sound..across whole spectrum...great defined bass, voices...highlevel details...the whole package.

I can...almost have to enjoy the music and forget looking for what else to work on....

SEN is running on 16 AAA enoloops per QUAD...sucking about 37mA bias and running at a shade under 50C each heatsink after 2 hours playing.

DC offset was trimmed to around 1 mA stable temp.

Running with SDTRANS - UGS - F5.

Testing tomorrow with my BJ2. :-).


Gorgeous....build one !
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Last edited by CeeVee; 2nd May 2013 at 07:35 PM.
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Old 3rd May 2013, 05:22 AM   #1433
EUVL is offline EUVL  Europe
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CeeVee,

Many congratulations with a truely DIY build (including own PCB).
And glad you like the results.

If you would ever consider another build, I still advice you to move the IV away from the digital circuit.
Physical separations of 50mm or more is no issue as the DAC is current out.
Try it once to convince yourself.

50C is OK for the sinks, as their main purpose is thermal tracking.
If you would want lower temperature, just increase sink thickness.
But I personally am quick happy with 50C.

As to the Cascode SEN, it will be realised once we finish the ES9018 DAC.
So please be patient. It is also only a hobby for us, as it is for you.


Patrick
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Old 3rd May 2013, 10:37 AM   #1434
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by EUVL View Post
CeeVee,

....

If you would ever consider another build, I still advice you to move the IV away from the digital circuit.
Physical separations of 50mm or more is no issue as the DAC is current out.
Try it once to convince yourself.

...
Thanks Patrick,
This is quick and dirty first try setup.
Even so it is highly rewarding.

This is proto...now that it works and certainly deserves my utmost effort for final version I'll design another PCB taking separation of digital and analog into account , with physical separate compartments in case.

...but now i can do this while listening to gorgeous music ....

...and keep working on my other main project

Do have one problem though...since i don't have any more 2SK369Vs ( this matched set was all i had ) I'll use 2SK372Vs in next build, heatsink must be a bit bigger though since power handling is smaller with these.

Last edited by CeeVee; 3rd May 2013 at 10:43 AM.
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Old 3rd May 2013, 12:29 PM   #1435
EUVL is offline EUVL  Europe
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You can get 2SK369V sets from us.


Patrick
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Old 3rd May 2013, 02:15 PM   #1436
CeeVee is offline CeeVee  Portugal
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I'll contact you about that. thanks.
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Old 3rd May 2013, 02:53 PM   #1437
EUVL is offline EUVL  Europe
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Contact WK direct. He'll take care of you.


Patrick
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Old 3rd May 2013, 09:13 PM   #1438
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Question Which one for PCM1704, load?

Quote:
Originally Posted by EUVL View Post
..........In the real PCM1704, the output current does not go through the 1k internal impedance, and the internal impedance only have a secondary effect on the accuracy of the current source. If you want to sim this properly, you need to put in the entire equivalent circuit of the R2R DAC.................................
Hi Patrick:

Between SEN and CEN, which one is better suited for PCM1704? What load (impedance) they present to PCM1704 respectively?

Regards
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Old 5th May 2013, 04:45 AM   #1439
EUVL is offline EUVL  Europe
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Both were designed for the PCM1704.
The rest please kindly read the article from Linear Audio. (Free download.)


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Old 5th May 2013, 09:07 PM   #1440
orelli is offline orelli  Italy
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Hi Patrick and all, just finished my Sen IV 18, and I am very satisfied by the sound . I can
confirm all the amazing rewiews made by the other members that made the IV conv.
It sounds VERY fantastic in all the areas ; dynamic, soundstage, bass , pace and rythm...
and very high spl levels without any form of distortion or compression. Very outstanting!
I supplied the SEN with four separated Salas shunt regs, 1.2r version. I used four r core
txs from Selectronics rated at 50VA, Hexfred diode bridges, Mundorf Lytics and none choke. I've not noise issue at all, the system is dark silent.
My preview IV conv was a Borbely EB 254 that sounded well , but the SEN is another thing. It wins low hands every comparison.
Thanks Patrick, NicMac and all the other members for their help.
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