August 11, 2011 - 07:21 am|
Ecco le mie modifiche applicate ad un sony cdp-11s (european version of sony cdp-200) :
Council to recover the heat sinks from old motherboards, ATX power supply or video cards.
November 18, 2010 - 06:42 am|
|Hi Alex--Very interesting post. My CDP-101 article only addressed replacing one of the STK6922's (IC204) since it is the hottest. You have shown that the LM1875 can replace IC304 as well. As you point out, the LM1875 is only stable for closed-loop gains of 10 or more and one side of IC304 is well below that. Your solution of adding a series RC from IC304-12 to IC304-9 is an excellent way to solve that issue.|
Thank you so much for your contribution!
November 18, 2010 - 02:58 am|
|HI! I have to replace both STK6922, LM1875 does the job, exept the loading/chucking motor chip, it starts to oscillate because of to LOW transfer coefficient(about 4), and becomes too HOT! An LM1875 works stable when has transfer coeff. above 10-12 (on high frequencies). To resolve the situation I just connected a cap of 10 nF & a resistor of 8, 2 kOhm in series, from pin 2(inverting input) of LM1875 to GND (pin 9 of STK6922) - no oscillation, no extreme heat! Bye. |
May 05, 2010 - 12:39 pm|
|(reedited) Hi MYPearl, Sorry that I do not have the document you mentioned. I do recall that Sony published articles on that in the Journal of the AES. That organization offers a paper about the CD format here: CD format paper|
--but it's only cost-effective if you are a member.
April 25, 2010 - 07:40 pm|
|There are so little proper conducted and documented AB tests... While everybody seems to agree ''those old DACS sound ancient" I have yet to see prove of that. Although I am sure I can hear the difference between a modern cheap chinese CD player and a quality one. But that is probably more due to the analog output desing and implementation as well ass clean power supply.|
BTW, doe you have a PDF copy of the theory manual on the CDP 101 and CD tech in general, that Sony released when this was a new product? It describes all CD technology in detail (CIRC, EFM etc,) as well as how these are implemented in the CDP 101 Hardware? I have seen a paper version long time ago but can't find it anywhere now... Cheers, Mendel
April 21, 2010 - 08:30 am|
|Hi MYPearl, Thanks for the compliment and the interesting post. The link is a very interesting read. I knew that digital audio had been validated by blind testing in the early days but it's great to see the real references.You see so many "golden ears" comments and claims these days. One wonders how these writers would perform with blind testing. A blind test box is on my projects list :) |