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Old 6th March 2012, 05:47 PM   #581
EUVL is offline EUVL  Europe
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Post #1, 2, 3.


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Old 6th March 2012, 05:49 PM   #582
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Thanks Patrick, could I use for BIII?
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Old 6th March 2012, 06:06 PM   #583
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If you meant ES9018 then there is a special version PCB for that.
See details in the GB thread.

Disclaimer :

I have not tried it myself, but perhaps I should some time around Easter, since others do not seem to be making any progress.


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Old 6th March 2012, 06:12 PM   #584
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Could you link me to specific schematic & BOM for ES9018 or is the same like post 1, 2 & 3? If exist the pcb how much cost the pcb, heatsinks & semis?

Thanks,
Felipe
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Old 6th March 2012, 06:37 PM   #585
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Schematics and BoM for Version 18 (for ES9018) do not exist. My laziness / lack of time.
All the details can be found in the GB thread.
Else qusp would be the person to ask. He knows that DAC much better than I do.

You would need 4 pairs of 2SK170/2SJ74 for each CEN V18 PCB instead of 2 pairs (for CEN V2).
And you would need to replace all the 2SK170s in SEN V2 by 2SK369V or BL in SEN V18.
This takes care of the higher current swing and requirement of lower Zin for the ES9018.

Cost, etc also in the GB thread. Please take time to read.
And you may contact MarkLai for availability and ordering details.


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Old 6th March 2012, 06:50 PM   #586
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Thanks again Patrick.
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Old 15th March 2012, 09:44 AM   #587
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Default BJT

Quote:
Originally Posted by EUVL View Post
BTW, we got a CEN BJT (4 transistors, 3 PSUs) working.
Thermal coupling is crucial.
Quite a bit noisier than CEN or SEN (JFET).


Patrick
Hi..
For no thermal drift. Check the Transistor array THAT340. ;-)

Caad.
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Old 18th March 2012, 03:30 AM   #588
EUVL is offline EUVL  Europe
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As there seems to be little or no progress with the ES9018 version of the SEN IV, I contacted NicMac with a schematics from me, and coached him to make it work. Well, it does work, and the schematics will follow once I tidied it up next week.

Nic agreed to me quoting his email sent a while ago.

"Hi Patrick,

I'm listening to the SEN with ES9018 now and so far its sounding real good!

I only have one balanced channel up and running so serious listening awaits the second channel (and me getting it hooked up to a head-amp).

I build exactly according to your schematics and the DC-offset was easily zeroed out. It stabilizes fairly rapidly (a few minutes) and appear pretty stable (< 1 mV for the first few hours). I will see how it varies over longer times.

Some time ago I got a USB scope (PicoScope 4262) and when I learn to use it I will let you know how it compares to the other I/V-stages I have for the ES9018.

I may be able to send you a couple of photos tomorrow.

Thanks for the detailed help!

Nic"

Thanks to Nic for supporting. More details to follow in the next few days, including schematics.


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Old 18th March 2012, 06:37 AM   #589
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has anyone used Joahim floating supply Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
I think It Is better than changing batteries everytime
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Old 18th March 2012, 08:35 AM   #590
EUVL is offline EUVL  Europe
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I use NiMH batteries.
There is no need to change battery in 3~5 years (my experience).
Just need an extra charging circuit with a DPDT relay for each supply.


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