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Old 29th January 2014, 10:30 PM   #641
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A V3 stopped working ? Impossible !

Sorry for the confusion around C7. I just looked at the V3 beta boards and those did not have a + printed at C7...Weird...

For those that would like to try I have some V3 beta boards with possibility for 3 x 2 mm XO's. We stopped with that as we couldn't test those in time (AFAIK). Also GND is write at the wrong side of the SPDIF connector. Order by PM please.
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Old 29th January 2014, 11:02 PM   #642
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That should have been "written", sorry.

To avoid "mailbox is full" messages: I have only 4 of them. Need to clear stock as new projects are starting.
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Old 30th January 2014, 06:36 PM   #643
Djinn is offline Djinn  Norway
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Default The DAC plays here to

The DAC along with the Subbu & Jean-Paul 5V supply sings here now that I finally ordered the missing RN1 that I must have lost during soldering.

Yes Murphy's Law proves it self, time after time.

PS! I used a 4.7uF tantalum for C31 with the positive side towards ground. "Thank you for reminding me on that Jean-Paul"




With regards and many thanks to all involved

Martin
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Old 30th January 2014, 06:49 PM   #644
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Hi Djinn, please let us know how it sounds.

BTW can you tell us which Phoenix connectors you used for SPDIF and L+R ? They look like an excellent replacement for those that cannot crimp Molex KK.
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Old 30th January 2014, 07:19 PM   #645
Djinn is offline Djinn  Norway
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Quote:
Originally Posted by jean-paul View Post
Hi Djinn, please let us know how it sounds.

BTW can you tell us which Phoenix connectors you used for SPDIF and L+R ? They look like an excellent replacement for those that cannot crimp Molex KK.
Here the part number for the connectors with both Mouser and Digi-key listed individually.


2 pin Mouser
571-282834-2

4 pin Mouser
571-282834-4


2 pin Digi-Key
A98333-ND

4 pin Digi-Key
A98335-ND



And according to my Stax Lambda Pro with the Stax SRM 717, the Dac plays beautiful with lots of details without the horrible high treble that the Stax without any mercy reveals.

And it keeps on getting better, and it will improve even more when I get this boxed with good and short cables.




With regards


Martin

Last edited by Djinn; 30th January 2014 at 07:45 PM. Reason: MS Word Table would not work
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Old 30th January 2014, 08:42 PM   #646
Awh is offline Awh  United Kingdom
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I left C31 unpopulated as i thought it was optional, could not find it in the kit, i may have lost it.
Should i put a 4.7uf tantalum there as i have the one that didn't go in C17?
I'm using a 10uf sal-rpm for C35, C34 has a 1uf.
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Old 30th January 2014, 09:10 PM   #647
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After recent experiments my personal opinion with the Subbu V3 DAC is that 10 ... 12 F altogether is on the edge. So the value of all caps together at Vneg should be equal to or under 10 ... 12 F but always more than 1 F. I have 3 pieces V3 (final versions) and the one with 1 F MLCC 0603 at the pins parallel to 1 F MLCC 1210 at the bottom of the board in parallel to a 4.7 F (Pana FC or better) sounded better than ones with 10 F Pana FC etc. I did this experiments last weekend to verify/test some of GaryB's findings.

No confusion but just a remark -> I even changed one V3 to :

- 1 F MLCC 0603 (C34) parallel to 1 F MLCC 1210 (C31) in parallel to a 1 F Wima MKS2 with 2.5 mm pitch (C32) and listened to that one since. Of course YMMV. One thing for sure is that 1 F alone really is not enough and above 10 ...12 F it goes either fine with SAL-RPM (you decide as I haven't done that comparison yet!) or a bit less good when 10 F wet electrolytics are concerned (Pana FC, Silmic II).

In the days of V2.6 I tried a lot and then found that 22 F in total was the maximum. With the V3 it seems to be somewhat more sensitive. Maybe the V3 is a tad more revealing. We learnt some audio-speak as you can see

My advice : solder a 1 F MLCC X7R for C31 and listen carefully if you like the result. You can later change the 10 F or leave it as it is with the 1 F for C31. I would not leave C31 unpopulated.
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Old 30th January 2014, 09:15 PM   #648
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Quote:
Originally Posted by Djinn View Post

And according to my Stax Lambda Pro with the Stax SRM 717, the Dac plays beautiful with lots of details without the horrible high treble that the Stax without any mercy reveals.

And it keeps on getting better, and it will improve even more when I get this boxed with good and short cables.

With regards

Martin

Thanks Martin, I will try to put the connectors either run the BOM or on the first page. Glad that again a new V3 plays satisfying.
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Old 30th January 2014, 09:31 PM   #649
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My advice : solder a 1 F MLCC X7R for C31 and listen carefully if you like the result. You can later change the 10 F or leave it as it is with the 1 F for C31. I would not leave C31 unpopulated.

Thanks J-P, I'll give it a go.
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Old 30th January 2014, 09:46 PM   #650
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Quote:
Originally Posted by Awh View Post
My advice : solder a 1 F MLCC X7R for C31 and listen carefully if you like the result. You can later change the 10 F or leave it as it is with the 1 F for C31. I would not leave C31 unpopulated.

Thanks J-P, I'll give it a go.
J-P, just to make sure I understand. The 10 - 12uf limit includes c31, c34, and c32/c35...correct? Thanks.
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