August 11, 2011 - 10:28 am|
Thank you for your kind remarks and for posting the links to your mods on the CDP-11s. Those do look like they will do a good job dissipating the heat. [For English-speaking readers, the line of Italian in the 7:21am posting translates as "Here are my mods, applied to a Sony CDP-11s".]
The LEDs you asked about are for disc detection. They illuminate a phototransistor below, when no disc is present. The CDP-101 does have them but they are on a small PCB which is separately mounted over the disc. You can see a small part of it in the photo at the bottom of page-2 of the pdf article. It appears at the bottom edge of the photo, over the disc, about 25% of the way from the lower right corner of the photo.
August 11, 2011 - 07:38 am|
|Sorry ... just one question! What are those two leds shown in the photo (cdp-11s?|
Is not present in the CDP-101 I wrong?
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.