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Old 2nd April 2006, 05:20 PM   #131
JeroenR is offline JeroenR  Netherlands
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And the corrected clock layout.
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Old 2nd April 2006, 07:08 PM   #132
jives11 is offline jives11  Europe
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Quote:
Originally posted by JeroenR
I built a clock into the player, see photo. It has a dedicated powersupply. The previously posted layout was incorrect, I had pin 3 and 5 connected the wrong way around. Over the coming week I will listen to it a bit more but first impression: mwoh... not impressed so far. It might be it needs some time or a better I/V or make it NOS.
Nice work. I also see you removed the DC blockers. You have some large (cerafine ?) caps on the 1540 supplies. what value are you using there ?

I have some small OSCONS here, but use the cerafines for the 2 opamp supplies (you have some black lyrtics here)
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Old 3rd April 2006, 07:17 AM   #133
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Just the DC blocking caps. I suppose its a start.
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Old 3rd April 2006, 08:50 AM   #134
JeroenR is offline JeroenR  Netherlands
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I started with pulling out the blocking caps. It made such a diff with my Marantz cd53. But... I do now have large plops when I change volume (stepped att.). Guess it is DC but as want to replace the opamps anyway I don't bother, did not even measure it...

The bigger caps next to the DACS are indeed cerafine. Well spotted!! The value is 220mu/35V. No science, just what I had on the shelve, the rest is cheaper Nichicon.

Yesterday I listened again and I had the feeling that things had improved after all. Voices (Christina Branco) sounded more present and music seemed to have more depth. But.... it was late, I spent a lot of time on the player, I was way past my first whiskey...

Next weekend I'm going to remove the SAA7030 or add a new I/V. Still a lot to gain I think and it's a fun machine to work with.
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Old 3rd April 2006, 09:48 AM   #135
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another approach is to run a dedicated supply to the SAA7030. I did this a few years ago to a CD65 and it made quite a big difference.
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Old 3rd April 2006, 10:49 AM   #136
Co& is offline Co&  Netherlands
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Default 1541(A) NON-OS CD104

Hello,

I would like to add my modification of the 104 (actually performed at a CD-304 which has the same pcbs) to make it non-os with the venerable 1541(A) 16-bits DAC.

The 1541(A) supports the format that is present before the digital filter, that is the mode with seperate left and right data inputs. I am not shure, but the full 16 bits should be intact at this stage.

I made a tap of the decoderpins for the 4 digitalsignal lines (latch,BCK,Ldata,Rdata) and connected them to the 1541A with 100R resistors and some 7474 filpflops clocked on the bck (seprate pins on decoder). The psu of the 1541A is seperate since this is paramount to good sound for this DAC (+/-5V and -15V reference). The 1541 is well treated with polypropylene decouplingcapacitors and a DEM reclocker (see other threads in this forum) tapped and devided from the decoder clock-pins. The IV conversion is done with a home made copperwire resistor and tubed amplifier/buffer.

A possible future upgrade is to reduce the DAC noise level even further with a devider network that reduces the digital input voltage swing.

I haven't modified the 304 in any way (even no capacitorshrinkfoil stripping or powercable upgrade) yet it actually works and sounds superb.

As time goes by I get more and more sensitive to the digitalness of most digitally filtered designs and lack of speed/drive and substance in most CMOS based DACS (1543 for a good exception).

Please there is no need explaining the need for oversampling or the use of elaborate analog filtering, the technical superiority of ss IV converters/buffers and the like. I am fully aware of the shortcomings of this design, yet I subjectively find this combination (104+1541 in NON-OS) the most musically satisfying digital combination I have ever heard.

I hope this provides for some new inspiration!

regards, Coen
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Old 3rd April 2006, 11:00 AM   #137
JeroenR is offline JeroenR  Netherlands
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Quote:
Originally posted by jives11
another approach is to run a dedicated supply to the SAA7030. I did this a few years ago to a CD65 and it made quite a big difference.
Thnaks, but I want to try the NOS tweak, so removing the 7030.
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Old 3rd April 2006, 11:14 AM   #138
JeroenR is offline JeroenR  Netherlands
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Default Re: 1541(A) NON-OS CD104

Quote:
Originally posted by Co&
Hello,

I would like to add my modification of the 104 (actually performed at a CD-304 which has the same pcbs) to make it non-os with the venerable 1541(A) 16-bits DAC.
Why the more complicated route with the 1541? Is the 1540 that bad? Or was it just the chalange?

Quote:
[i]I hope this provides for some new inspiration!

regards, Coen [/B]
Absolutely. But being a man I'm more turned on by photo's.
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Old 3rd April 2006, 04:29 PM   #139
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Question 1h???

Quote:
Originally posted by JeroenR
And the corrected clock layout.

1H??????
(That is 1000 mH)
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Old 3rd April 2006, 07:44 PM   #140
JeroenR is offline JeroenR  Netherlands
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Default Re: 1h???

Quote:
Originally posted by Elso Kwak



1H??????
(That is 1000 mH)

Uhhh..... 1 is indeed 1000m.

Why do you ask.

Serious, I have no clue. I asked for 400mH because that is what I remember Guido reply once in a post. I got this one. (you can see it in the photo in my post on 20-2 in this thread, it is the small black dot in the middle) They told me it is 1H. As I do not have direct access to a decent parts-shop where I live I just used it. Next time I open the hood of the player I will check the label. My electronics experience is limited so I do not (yet) recognize silly values.

What would suggest as a good value?

Thanks,

Jeroen
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