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Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Yamaha CDX-1050 DAC
Yamaha CDX-1050 DAC
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Old 2nd April 2007, 08:07 PM   #1
maxpou is offline maxpou  Canada
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Default Yamaha CDX-1050 DAC

Hi,
I try to analyze this circuit but I have difficulty to understand. Somebody can help me because this cd player are in my opinion a good transport but the DAC and output circuit is very bad. Maxpou
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Old 2nd April 2007, 08:08 PM   #2
maxpou is offline maxpou  Canada
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output circuit
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Old 3rd April 2007, 05:07 AM   #3
stephensank is offline stephensank  United States
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Looks like some kind of semi-discrete version of a Panasonic MASH converter. Looks like it would sound terrible, no matter how much it was upgraded.
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Old 3rd April 2007, 02:48 PM   #4
maxpou is offline maxpou  Canada
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can i bypass the ic16 and 17 (NAND gate). Why the master clock is connected to pin 1 and 2 of ic 15 after connected to pin 13 for output to pin 12, it's for jitter? And enters to pin 11, out pin10, in pin 5 and out pin pin6 to the NAND gate. I don't understand this circuit. thank you! Maxpou
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Old 4th April 2007, 06:26 AM   #5
stephensank is offline stephensank  United States
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It looks to me like the NAND gates are performing as part of the actual d/a conversion, which is why I described it as a semi-discrete sort of mash circuit. But without specific data on the dac chip driving them, I can't really be sure. It looks to me like it has not a prayer of sounding great, no matter what you did to it, short of scrapping the whole dac section & building an entirely new one. Easier to plug it into an external dac unit, though, I think.;-)
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