Marantz CD63 & CD67 mods list - Page 1010 - diyAudio
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Old 5th June 2008, 07:49 PM   #10091
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Quote:
Originally posted by Malefoda
Got my 470/16 BG for the DAC analog. These things are big, do they fit around opamps?
Anyway I'll stick with the 220/16 BG there...

Quote:
Originally posted by rowemeister
Quality caps are always big
The 470uF JUST fit with a little squeeze, the 220uF fit perfect.
I have just the same issue.

I think I will remove the 220uF BG around the opamps and squezze the 470uF in.

I will use the 220uF on CD15 CD16.

Ricardo
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Old 5th June 2008, 09:44 PM   #10092
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Quote:
Originally posted by rowemeister
Personally I think you should connect it to the star earth that way the gnd references are the same on all pcbs.
Hi Brent

Fitting the DAC clock on pin 28 (using U196) will be easy.

Can I remove the stock X´TAL psu line ?
Maybe I could remove RD01 CD04 CD05.

Ricardo
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Old 6th June 2008, 07:27 AM   #10093
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You still need the 5V supply for the clock cct on the dac. Your best bet is to remove RD01 and solder in a 7805 so that it's more isolated from the rest of the circuit. Supply the 7805 from underneath the PSU from the big smoothing cap (+20V). Just check to see if the reg gets warm, I don't think it will.

Doing this will require the psu gnd connecting to star gnd

Brent
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Old 6th June 2008, 08:44 AM   #10094
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Quote:
Originally posted by rowemeister
Supply the 7805 from underneath the PSU from the big smoothing cap (+20V).

Doing this will require the psu gnd connecting to star gnd

Hi Brent

You mean I can link the 7805 to the new PSU2 ?
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Old 6th June 2008, 09:13 AM   #10095
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Yes, supply voltage from the main smoothing cap before the SPower regulation.

Brent
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Old 6th June 2008, 01:10 PM   #10096
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Quote:
Originally posted by rowemeister
Yes, supply voltage from the main smoothing cap before the SPower regulation.
Brent

Should I use a LM340AT instead of a 7805 to improve noise rejection ?

Or maybe a LM317 with a gyrator ?

Regards

Ricardo
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Old 6th June 2008, 01:14 PM   #10097
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Yes of course

The better the reg the better outcome you will get. A Raygulator type device will work a treat

Brent
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Old 6th June 2008, 02:34 PM   #10098
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Quote:
Originally posted by rowemeister
Yes of course
The better the reg the better outcome you will get. A Raygulator type device will work a treat
Brent

While I wait I was thinking about placing one Raygulator on +5v DAC Digital.

I already have a dedicated PSU for this reg.

What improvements should I expect from such modd? (I already have the Spower on DAC Analog and the sound is very good indeed with good integration and much better detail.)

Ricardo
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Old 6th June 2008, 02:54 PM   #10099
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Using something like an SPower will bring bigger gains but again thats going to cost alot more money!! So a Raygulator here will bring about better timing, a more precise sound etc. There will be less of that digital sound. Do it.

Just using 7805 everywhere brings gains so a Raygulator will improve further.

Brent
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Old 6th June 2008, 05:43 PM   #10100
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Quote:
Originally posted by rowemeister
Using something like an SPower will bring bigger gains but again thats going to cost alot more money!! So a Raygulator here will bring about better timing, a more precise sound etc. There will be less of that digital sound. Do it.
Ok

I will replace RD04 by the raygulator, remove CD07 and replace CD06 by a 470uF Oscon.

Do I need to bypass the OsCon ?

Ricardo
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