Upgrade output Shanling CD-S100 MkII

[Manu]

No! To me ...


Manu
(is watching ya)

[Zen Mod]

Originally posted by Manu
........
(is watching ya)

yup

[Zen Mod]

Originally posted by Manu
No! To me ...


Manu
(is watching ya)

hehe

seems that you sold your Drekling too early ......

[Manu]

[Manu]

Originally posted by Zen Mod

yup

This one should be prefered version for us pathetic pooftaah...

Jacco goes Karaoke

[Zen Mod]

Originally posted by Manu



This one should be prefered version for us pathetic pooftaah...

Jacco goes Karaoke

tell me more about Arno ;

on my email thingie ..... not to pollute this nice topikkkkk

[CeeVee]

...I'll invite both of you for beers....or portuguese wine...much better for listening session....works much better than changing coupling caps .....hehe.

[CeeVee]

Hi ZM....

Made a lot of changes...

1 - Reduced 270R resistance to 100R.
2 - eliminated the 1nF caps
3 - reduced I/V resistance ti 1k5, had too much gain.
4 - realigned the of-set
5 - changed coupling caps as you suggested but i didn't have 20uF so i tried some 47uF SilmicIIs i had around.
6 - removed a 220uF cap i had on power supply rails on the board since i'm getting 15V from op-amp supply pin of Shanling.


Result:
Sound is even cleaner, sound stage fantastic, relaxed , not tiring, great effortless dynamics...bass is a tad better but not much.

[Zen Mod]

Cee
tell me - what you are calling offset ?

what/which voltage you are exactly trimming with that pot ?

edit:

from sheet :

...... The common level of the I/V conversion circuit must be the same as the
common level of DAC I that is given by the V 2 reference voltage, 2.5 V dc. ........

so - you must try to set outputs of DAC/inputs of I/V stage to that potential ........... fiddling with both trimmers ;

there is your stolen bass - difference between 2V5 and 3V4

further :

Made a lot of changes...

1 - Reduced 270R resistance to 100R.
2 - eliminated the 1nF caps
3 - reduced I/V resistance ti 1k5, had too much gain.
4 - realigned the of-set
5 - changed coupling caps as you suggested but i didn't have 20uF so i tried some 47uF SilmicIIs i had around.
6 - removed a 220uF cap i had on power supply rails on the board since i'm getting 15V from op-amp supply pin of Shanling.

1. OK ; but - maybe you'll need to trim them ,after achieving 2V5
2 . confirm with CRO that you don't have much garbage above 20K
3.OK
4. hehe
5.leave silmics in , to the end of prototyping
6 . solder them back

[CeeVee]

Hi ZM,

The offset i adjusted on top of 1k5 I/V resistor to1/2 Vcc, as Rudolf Suggests:

http://diyparadise.com/ssiv.html

...... The common level of the I/V conversion circuit must be the same as the
common level of DAC I that is given by the V 2 reference voltage, 2.5 V dc. ........


Hmmmm well that is easy enough to check...might be right, actually i did try the boards before realigning the DC do half Vcc and although level was lower there was more bass.....i think, will try that.