Joachim Gerhard Filter Buffer for ES9022 - Page 31 - diyAudio
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Old 17th December 2012, 09:37 AM   #301
syklab is offline syklab  Hong Kong
diyAudio Member
 
Join Date: Jul 2009
Location: Hong Kong
Hi WK,
Just received the PCB and started work by going thru the BOM and schematic but seem like some of resistor value on the schematic is somewhat different from the BOM. Is there a updated schematic available?

Thanks

BoM for one PCB

4x 10R 0.5% SMD 0805 Digikey RR12Q10DCT-ND
6x 100R 0.5% SMD 0603 Digikey RR08P100DCT-ND
2x 0R SMD 0603 Digikey P0.0GCT-ND
2x 10k 0.5% SMD 0603 Digikey RR08P10.0KDCT-ND
2x 470R 0.5% SMD 0805 Digikey RR12P470DCT-ND

4x 220µF 25V Digikey P10271-ND
2x 150pF 16V PPS SMD 0603 Digikey PCF1461CT-ND

2x 18mH 5%, matched to 1% Mouser 434-02-183J

Joachim Gerhard Filter Buffer for ES9022
The orginal schematics
Anybody using the new ESS Vout DAC (ES9022)?
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Old 17th December 2012, 11:38 AM   #302
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
syklab, I don't have the datasheet close at hand right now but from memory the first part of the schematic is the datasheet output filter which is assumed to be on the DAC board, it is on the xen audio ES9022 boards and also acko's ES9023 boards. I'm not familiar with details of other implementations of the ES9023 DACs.

I'd rather EUVL or WK or JG confirm components for other positions as I don't wish to lead you astray. Though I *think* 10k is for R4 and R5 represents the internal resistance in the inductor ...



Chris

Last edited by hochopeper; 17th December 2012 at 11:44 AM.
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Old 17th December 2012, 12:22 PM   #303
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Attached is the (original) schematics V3 according to which we built our prototype and made up the Bill of Material.
This is the exact circuit as on the PCB itself.

The following discrepancies exist between our schematics (V3) and that in the following link (version 3.1) :
Anybody using the new ESS Vout DAC (ES9022)?

(the component designations below are according to the Joachim Gerhard schematics in the above link)

a) R6,C4 do not exist on the PCB, as they are part of the ES9023 DAC circuit.
b) R2, P1 are removed as we guarantee proper matching, and hence no need to trim DC offset.
c) R3 has been changed to 100R, and 2 additional gate stoppers added for the J111s.
d) R4 has remained 10k and not updated to 18.9k

This is identical to what we built, tested and then approved by Joachim.
Apart from the 10k/18.9k discrepancy, the bill of material remains correct.
You can count this one (R4 update) on me as my mistake.
And I'll see if we can send 200x 18.7k Susumu 0603 to Fran, before he sends them to everyone.
(18.9k is not stocked by Digikey.)


Hope it is clear,
Patrick

.
Attached Files
File Type: pdf 9022 JG Filter Public 121217.pdf (512.2 KB, 369 views)
__________________
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Last edited by EUVL; 17th December 2012 at 12:45 PM.
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Old 17th December 2012, 04:02 PM   #304
syklab is offline syklab  Hong Kong
diyAudio Member
 
Join Date: Jul 2009
Location: Hong Kong
Quote:
Originally Posted by EUVL View Post
Attached is the (original) schematics V3 according to which we built our prototype and made up the Bill of Material.
This is the exact circuit as on the PCB itself.

The following discrepancies exist between our schematics (V3) and that in the following link (version 3.1) :
Anybody using the new ESS Vout DAC (ES9022)?

(the component designations below are according to the Joachim Gerhard schematics in the above link)

a) R6,C4 do not exist on the PCB, as they are part of the ES9023 DAC circuit.
b) R2, P1 are removed as we guarantee proper matching, and hence no need to trim DC offset.
c) R3 has been changed to 100R, and 2 additional gate stoppers added for the J111s.
d) R4 has remained 10k and not updated to 18.9k

This is identical to what we built, tested and then approved by Joachim.
Apart from the 10k/18.9k discrepancy, the bill of material remains correct.
You can count this one (R4 update) on me as my mistake.
And I'll see if we can send 200x 18.7k Susumu 0603 to Fran, before he sends them to everyone.
(18.9k is not stocked by Digikey.)


Hope it is clear,
Patrick

.
Hi,
According to the schematic that R4 is 100R and R1 is 10K. Is that correct ?

Best regards
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Old 17th December 2012, 04:43 PM   #305
shoom is offline shoom  Europe
diyAudio Member
 
Join Date: Jul 2010
Location: Worcestershire
Quote:
Originally Posted by EUVL View Post
Attached is the (original) schematics V3 according to which we built our prototype and made up the Bill of Material.
This is the exact circuit as on the PCB itself.

The following discrepancies exist between our schematics (V3) and that in the following link (version 3.1) :
Anybody using the new ESS Vout DAC (ES9022)?

(the component designations below are according to the Joachim Gerhard schematics in the above link)

a) R6,C4 do not exist on the PCB, as they are part of the ES9023 DAC circuit.
b) R2, P1 are removed as we guarantee proper matching, and hence no need to trim DC offset.
c) R3 has been changed to 100R, and 2 additional gate stoppers added for the J111s.
d) R4 has remained 10k and not updated to 18.9k

This is identical to what we built, tested and then approved by Joachim.
Apart from the 10k/18.9k discrepancy, the bill of material remains correct.
You can count this one (R4 update) on me as my mistake.
And I'll see if we can send 200x 18.7k Susumu 0603 to Fran, before he sends them to everyone.
(18.9k is not stocked by Digikey.)


Hope it is clear,
Patrick

.
Hi Patrick

Thanks for the above info but I’m not part of the GB and finding it a little difficult to source those 18K9 resistors.
Any idea where I may find some?
Thanks
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Old 17th December 2012, 04:44 PM   #306
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
According to the numbering of MY schematics in the pdf above, yes.
Which means if you want to use V3.1 of Joachims, the 10k needs changing to 18.7k.
We'll order 200 of those and send to Fran.
Already arranged, so you have both options.


Patrick
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Old 17th December 2012, 04:45 PM   #307
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Digikey has 18.7k. I consider 1% deviation close enough.
The inductors will have more variations.


Patrick
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Old 17th December 2012, 06:34 PM   #308
shoom is offline shoom  Europe
diyAudio Member
 
Join Date: Jul 2010
Location: Worcestershire
Quote:
Originally Posted by EUVL View Post
Digikey has 18.7k. I consider 1% deviation close enough.
The inductors will have more variations.


Patrick

Hi Patrick
Thanks for the Info on the 18K7 which I have just ordered from Digikey.
Yup those inductors
I needed a few to get a close matched pair.
Looking forward to hearing the Filter Buffer and grateful to WK for all of his hard work matching and soldering.
Thanks again
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Old 17th December 2012, 11:47 PM   #309
shoom is offline shoom  Europe
diyAudio Member
 
Join Date: Jul 2010
Location: Worcestershire
Hi Patrick

not sure why but i'm having problems opening your attachment.

Attached is the (original) schematics V3 according to which we built our prototype and made up the Bill of Material.
This is the exact circuit as on the PCB itself.
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Old 18th December 2012, 12:14 AM   #310
GaryB is offline GaryB  United States
diyAudio Member
 
Join Date: Sep 2002
Location: Silicon Valley
Quote:
Originally Posted by shoom View Post
not sure why but i'm having problems opening your attachment.
In case you're having trouble with the PDF, here is the same file in jpeg format.
---Gary
Attached Images
File Type: jpg JG_Filter_ES9023.JPG (50.5 KB, 558 views)
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