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Old 18th March 2012, 11:26 AM   #591
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Thanks Patrick and Nic. Looking forward to the details.
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Old 18th March 2012, 11:53 AM   #592
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Quote:
Originally Posted by EUVL View Post
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.


Patrick
Very good news, thanks Patrick & Nic to make it possible.
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Old 18th March 2012, 12:28 PM   #593
EUVL is offline EUVL  Europe
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For those who cannot wait, here is the hand drafted schematics.
Worked first time.



Patrick


PS

9018 in stereo mode (2 channels)
Iout connection for one phase of one channel shown.
Attached Images
File Type: jpg SEN IV ES9018 Schematics.jpg (159.6 KB, 610 views)
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Last edited by EUVL; 18th March 2012 at 12:43 PM.
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Old 18th March 2012, 12:36 PM   #594
EUVL is offline EUVL  Europe
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For those who wants to use different voltages, here is a spreadsheet to calculate R1, R2.

Type in Vs of the SEN circuit intended, and the AVcc of the 9018 (nominal 3.3V).
Choose a value for R2, the rest would be calculated automatically.
I normally aim at having R1+R2 around 1M.


Patrick

.
Attached Files
File Type: zip SEN IV V18 Config.zip (3.3 KB, 181 views)
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Last edited by EUVL; 18th March 2012 at 12:46 PM.
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Old 18th March 2012, 02:06 PM   #595
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Thank you very much for sharing Patrick, sorry my ignorance for floating supply +18V connected R1 side & for -18V connected R2 side?
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Old 18th March 2012, 02:10 PM   #596
EUVL is offline EUVL  Europe
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The total voltage is 18V, and not +/-18V, just to be 100% clear.
The +ve side of the supply is connected to R1, and the -ve to R2.
You only need to follow the SEN IV PCB V18. It is all labelled.


Patrick
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Old 18th March 2012, 02:31 PM   #597
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So I have to connect +18V to R1 & GND to R2?

Felipe
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Old 18th March 2012, 03:10 PM   #598
EUVL is offline EUVL  Europe
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In a floating supply, there is no "Gnd".

If you have a set of batteries wire up to give 18V, the plus side goes to R1, and minus side goes to R2.
Just follow the battery symbol in the schematics.


Patrick
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Old 18th March 2012, 03:18 PM   #599
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OK now I understand, so I can use two shunt regulators one +9V for R1 & the other -9V for R2 and both GND connecteds together, right?
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Old 18th March 2012, 03:23 PM   #600
EUVL is offline EUVL  Europe
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> OK now I understand, so I can use two shunt regulators one +9V for R1 & the other -9V for R2 and both GND connecteds together, right?

Yes, but this "GND" of the two shunts should never ever be connected to anything else, especially anything to do with the ES9018 PCB.
On the other hand, I do not understand why you want to use 2x 9V shunt when you can just use a single 18V supply, whatever it is.

I repeat, anything to do with the floating supply should not be connected to Gnd.
Please see Joachim Gerhard's floating supply schematics if in doubt.

And I strongly suggest you get the circuit to work with 2x normal 9V alkaline batteries first.
When everything works, then you can start fiddling with fancy supplies and what not.

Learn to walk before learning to run.


Patrick
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