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Upgrade output Shanling CD-S100 MkII
Upgrade output Shanling CD-S100 MkII
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Old 30th September 2008, 10:59 AM   #21
CeeVee is offline CeeVee  Portugal
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Upgrade output Shanling CD-S100 MkII
The 3u3 caps, should they be nonpolar ?
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Old 30th September 2008, 11:30 AM   #22
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Quote:
Originally posted by CeeVee
The 3u3 caps, should they be nonpolar ?

for test - irrelevant
use whatever you have , even mixed (few in parallel )

everything from 3u3 up will do the job .

hehe - just try to have same caps in all 4 legs ........

NB - point of test is to hear have you gained in clarity and "singing "

frequency extremes should be better in final variant , when we adjust all impedance and voltage/current conditions

edit : whatever caps you use - it can't be worse than it is now

OPA xxx ........... gimme a break .........
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Old 30th September 2008, 08:18 PM   #23
CeeVee is offline CeeVee  Portugal
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Upgrade output Shanling CD-S100 MkII
Ok ZM,

Test is done, as for level...i don't see much difference...with or without op-amps, so DAC easily drives UGS.

Guess that is why there is one more Resistor going from pin DAC 20 to both op-amps, one each to where pins 2 and 3 are connected to each other ( this is not in the app-note schematic ).

In terms of tone.....oh yes much better, although ofcourse there is distortion at top end but tone is much more open and true.
Distortion is i guess due to the "beautifull" rat's nest.

I can now believe the piano in Diana Krall's CD, sounds right...and this has been my reference all along, before it sounded dull, not as a piano should, sharp and clean...up front.

by the way i have all same components in both channels.

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Old 30th September 2008, 08:40 PM   #24
Zen Mod is offline Zen Mod  Serbia
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Upgrade output Shanling CD-S100 MkII
Quote:
Originally posted by CeeVee
Ok ZM,

Test is done, as for level...i don't see much difference...with or without op-amps, so DAC easily drives UGS.

Guess that is why there is one more Resistor going from pin DAC 20 to both op-amps, one each to where pins 2 and 3 are connected to each other ( this is not in the app-note schematic ).

In terms of tone.....oh yes much better, although ofcourse there is distortion at top end but tone is much more open and true.
Distortion is i guess due to the "beautifull" rat's nest.

I can now believe the piano in Diana Krall's CD, sounds right...and this has been my reference all along, before it sounded dull, not as a piano should, sharp and clean...up front.

by the way i have all same components in both channels.

OK - while you still have rat's nest - try to vary our I/V resistor values - say - from 820 to 2K2 ...... and try to find value where overall sound is at best ;

you can also try to decrease these 4n3 caps ...... gradually to 2n7

hehe

just for my pleasure - give me few pics of rat's nest ........
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Old 30th September 2008, 08:47 PM   #25
CeeVee is offline CeeVee  Portugal
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Of course ZM,
I'll post today's rat's nest in awhile but more tests only for tomorrow.
I'm preparing for a conference next week....I'll be all week in Oostende ( north Belgium ) but i'll be able to do a few more tests until Thursday...after that it's a whole week for your fertile mind to think on the issue...along with all others here of course.
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Old 30th September 2008, 09:01 PM   #26
CeeVee is offline CeeVee  Portugal
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A closer look.

Just a thought; i did not lift the caps in parallel with the resistors,

Guess i need to do this and test again.
Also maintained the 100n caps to ground.
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Old 30th September 2008, 09:25 PM   #27
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Quote:
Originally posted by CeeVee
Of course ZM,
I'll post today's rat's nest in awhile but more tests only for tomorrow.
I'm preparing for a conference next week....I'll be all week in Oostende ( north Belgium ) but i'll be able to do a few more tests until Thursday...after that it's a whole week for your fertile mind to think on the issue...along with all others here of course.

on second thought - try altering values of those 4n3 first , and later try to alter values of resistors ;

bon voyage ....... in any case ........ (manu - did I wrote it OK ?)

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Old 30th September 2008, 09:28 PM   #28
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by CeeVee
A closer look.

Just a thought; i did not lift the caps in parallel with the resistors,

Guess i need to do this and test again.
Also maintained the 100n caps to ground.

I didn't saw that post of yours , while typing previous .....

be sure that output pins at DAC are completely free of any load ( form original circuit ), be it cap or resistor

you remember that I don't know exactly how that output configuration looks in Drekling .......

100n to ground ?
where ?
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Old 30th September 2008, 09:33 PM   #29
CeeVee is offline CeeVee  Portugal
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Upgrade output Shanling CD-S100 MkII
don't wish me bon voyage yet...you will here more from me this week before i go.

I'm the one that can´t wait to hear the Shanling singing properly.

On a curiosity note: i was looking at the Shanling CD-200T board, a picture on the web....and you would not believe it..., same DAC but more interestingly...same output, even board layout.

..cookbook ?

...100n on board are the C11, C12 and C21, C22 on schematic you posted from data sheet.
They are still in, should i lift them as well to have a clean output from the DAC ?

What i'll do before i go is post an exact schematic, ill get it from the PCB by tomorrow, np.
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Old 30th September 2008, 09:45 PM   #30
Zen Mod is offline Zen Mod  Serbia
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Upgrade output Shanling CD-S100 MkII
Quote:
Originally posted by CeeVee
don't wish me bon voyage yet...you will here more from me this week before i go.

I'm the one that can´t wait to hear the Shanling singing properly.

On a curiosity note: i was looking at the Shanling CD-200T board, a picture on the web....and you would not believe it..., same DAC but more interestingly...same output, even board layout.

..cookbook ?

you can give me that link ....

anyway - if you wanna Cook Book and dedicated output stage , you must send me one - for testing and later proper disposal ........


Quote:
Originally posted by CeeVee

...100n on board are the C11, C12 and C21, C22 on schematic you posted from data sheet.
They are still in, should i lift them as well to have a clean output from the DAC ?

What i'll do before i go is post an exact schematic, ill get it from the PCB by tomorrow, np.
desolder them promptly ; they're choking output in our raw topology.
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