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Old 20th September 2012, 05:03 PM   #551
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Hi skouliki

There are some missing data's in your Post#540, DAC has 28 pins...
I'll try to give you more informations tomorrow afternoon.

Phil
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Old 20th September 2012, 05:53 PM   #552
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Location: Athens
Hi korben.
I wasnt clear- you re right. The pins i left out where connected to c10, r11, c11

DAC:

1.58--- ---0.00
1.62--- ---3.52
0.03--- ---0.00
0.00--- ---1.66
3.56--- ----0.00
1.14--- ---(-3.34)
0.00--- ---(-1.70)
0.00--- ----1.73

C10:
0.00
3.56

R11:
1.14
0.00

C11:
-1.70
1.73
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Old 21st September 2012, 11:44 AM   #553
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Hi skouliki

C10 & R11 seems fine to me, close values.
C11 is different as I've got -2.20/1.25 vs -1.70/1.73 ; 0.5V lost somewhere, check it
Is it due to Pin16 = 0v ? C11 seems to be a dedicated internal ES9023 cap.

ES9023 Pins
Pin1 -> R7______________Pin16 -> ?
Pin2 -> R8______________Pin15 -> R13
Pin3 -> R9______________Pin14 -> Gnd
Pin4 -> Gnd/C10_________Pin13 -> R12
Pin5 -> C10b+___________Pin12 -> Gnd
Pin6 -> R11/C9__________Pin11 -> C12/C32-
Pin7 -> R15/C15Gnd______Pin10 -> C11
Pin8 -> R14/C14Gng______Pin09 -> C11

Pin16 is 0v on your DAC, it seems to be faulty but on the scheme there is no connexion shown...
Your DAC values seems fine to me, except Pin16 and previous remark about C11.
Maybe someone more skilled than me could give an helping hand.

Last edited by korben69; 21st September 2012 at 12:03 PM.
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Old 22nd September 2012, 05:46 PM   #554
syklab is offline syklab  Hong Kong
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Try to power it with battery and the result is so clean and detail, dead quiet. Just one of this battery is enough for at least 6 hours of music.

Click the image to open in full size.
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Old 23rd September 2012, 06:25 PM   #555
qusp is offline qusp  Australia
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looks like a fun build, but i've gotta say, that huge film cap could not act more like an aerial if that was your goal. twisting the wires in this case does not help, if anything if it was part of a wide band amplifier it would easily cause it to oscillate. see you are twisting the same signal with an earlier version of itself, not ground or negative as is usually the case when twisting pairs.

Last edited by qusp; 23rd September 2012 at 06:30 PM.
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Old 23rd September 2012, 06:26 PM   #556
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Thank you
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Old 23rd September 2012, 06:33 PM   #557
qusp is offline qusp  Australia
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no problem, have fun

syklab: why have you got the case laid out like that? why not put the dac and its reception tower, erm caps ( ) all over on the right side right next to the outputs, leave all the power supply stuff over on the left side and connect DC from the regulators over the longer distances.

the dac has on-board regs anyway so if any connection can afford to be long, its those ones.

Last edited by qusp; 23rd September 2012 at 06:40 PM.
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Old 23rd September 2012, 06:35 PM   #558
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You know how tiring is it to keep telling to keep connections short and to clean PCB's from flux....
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Old 23rd September 2012, 07:29 PM   #559
qusp is offline qusp  Australia
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Quote:
Originally Posted by jean-paul View Post
You know how tiring is it to keep telling to keep connections short and to clean PCB's from flux....
no, but I can imagine thats why I came back to edit and add more detail to that post, to save you from having to.
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Old 23rd September 2012, 10:30 PM   #560
GaryB is offline GaryB  United States
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Default pictures of my build

I've now gotten my DAC + JG style buffer cased up and more or less completed. I housed it in a Hammond cast aluminum box, approximately 220mm x 145mm x 50mm. I managed to scrounge up some 1uf 50v BG NX and 100uf 6.3 BG N caps, so I included those in the build. The sound continues to impress me - kudos to JP and Subu. I like the sound slightly better with the JG buffer but there is a lot more cost and work associated with building it this way. One needs an extra transformer and power supply and nearly twice as much room. But the resulting DAC still is reasonably compact and I think it's worth the effort.
---Gary
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