Yamaha CDX-1050 DAC

maxpou · 2nd April 2007, 07:07 PM

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

maxpou · 2nd April 2007, 07:08 PM

output circuit

stephensank · 3rd April 2007, 04:07 AM

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.

maxpou · 3rd April 2007, 01:48 PM

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

stephensank · 4th April 2007, 05:26 AM

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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3rd April 2007, 04:07 AM	#3
stephensank diyAudio Member Join Date: Oct 2006	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.

3rd April 2007, 01:48 PM	#4
maxpou diyAudio Member Join Date: Apr 2006 Location: Québec	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

4th April 2007, 05:26 AM	#5
stephensank diyAudio Member Join Date: Oct 2006	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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