Hi, I've posted the same on head-fi, Ill try even here in case someone could help..

I've got some problems with the zero..Ive changed the two 330uf caps on top of the four decoupling caps with 470uf oscon, and also applied the bypass at all these caps. Now my problem is that right channel turn down on volume, not so much, but clearly noticeable. What should have happened? Bad contacts or soldering? (the one on decoupling caps are very bad, the little circle tin went away some tweaking ago, but were working before, maybe get worse) Maybe Ive lost some contacts in the upper side of the pcb?

If someone can help, Ill be very grateful!!

Ps: Ive found that the right channel have a different hiss, more loud, and if I touch the second decoupling caps on the left, I heard like an interference, like a mass problem maybe.

This post has been edited by Termophilus: Dec 24 2008, 06:16 AM

The lower one is minimal Negative feedback. It gives the lowest distortion.

The upper position is more Negative feedback, more output power and more distortion.

^errr?

Feedback is suppose to lower down distortion. Up to the point when too much of it leads to the increase of the higher harmonics distortion.

having lesser feedback gives more distortion and higher output impedance in fact. But since the distortions are mainly odd harmonics, it does give a falsified impression of "warmth"

This post has been edited by LittleGhost: Dec 24 2008, 10:11 AM

Wow, you upgraded to AudioSpace? Expensive stuff!

i think is not KI just CD63 MkII if KI worth RM1k

This post has been edited by abel: Dec 25 2008, 02:42 PM

I have been using it the long time. it is a entry level and compact.

Hi, I need some technical help from you guys..
Ive been trying to fix a problem with false contact in the decoupling caps area, and messing around with one of them, Ive touched with one leg the heathsink of a voltage regulator wich is under it (I did it with when the dac was running).
I think of a short circuit that burned something, maybe the voltage regulator (lm317) or maybe something else, because the sound now is so low that I can barely hear something at max volume of my amp. My uncle, which is an electrical technician, told me that a schematic will help to find out what could have happened, and if other components have burned. If someone can give me some tips about, even suppositions, or know if a schematic of the zero exists, please tell me!
Thanks a lot!

there isnt any schematic due to commercial products with rights.

what u can do is measure the power supply voltage at the 317 and 117 terminal. u should get +15 and -15 volt. becareful not to short it.

This post has been edited by ccschua: Dec 28 2008, 08:07 AM

Thanks ccshua, I've checked the power supply and appears to be fine, Im trying to find out whats happened with the help of some skilled friend, and maybe its the dac which is burned.

Allow me to wish happy new year to all!!

Pls tell us what u have found out. Did u get the voltage to the DAC, 1 x 3V and 3x5V dc.

Did u get smoke coming out when u short something. Any electronic that has smoke means it is fried.

Ive seen no smoke, no burning things, just the sound went away, and now is almost absent (only at max volume I can barely hear something). The most probably thing is that the ad1852 burned, or something in the digital path, I dont know.
I'm planning to change it with dac100 of audiogd, Ive read you have found it more musical.
Maybe I can even recycle some pio caps to bybass some things on it?

OT.
Hi all,

I may intend to sell off my Zero Dac , presently using with earth. Run in for 6 months. Zero knowledge on further improvements.

PM if you are interested.

10Q.

------------------------
All PMs replied. 10Q

This post has been edited by SKY 1809: Jan 4 2009, 04:51 PM

my zero turn to like this liow



This post has been edited by abel: Jan 6 2009, 11:50 PM

woow...
speechless

they are 2 white firecraker called Mundorf M-cap lying there.

bcoz my zero are KO already soo i use the case for my DIY preamp



This post has been edited by abel: Jan 7 2009, 11:42 PM

Ooops I also have 2 white sausage but they are from Taiwan. Now testing the sound.

Why it is dead?

from static burn the IC

This post has been edited by abel: Jan 21 2009, 09:34 AM

if you want to let go of your now defunct zero board i am interested in it as I have done some damage to the copper rails on mine and probably irrepairable.

let me know what you think.

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Added on February 6, 2009, 2:42 pmhi abel, any chance you still have the board of the zero? i would be interested in buying it off you if it is not too damaged.

cheers

This post has been edited by chefsinc67: Feb 6 2009, 02:42 PM