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Marantz CD63 & CD67 mods list
Marantz CD63 & CD67 mods list
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Old 31st December 2009, 11:05 PM   #13791
Glenn2 is offline Glenn2  United Kingdom
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Quote:
Originally Posted by RCruz View Post
Hi Glenn

Your post finally removed my doubts about regulating the servos......

You are very lucky to have work.... even if it happens to be during this period...

Happy New Year
Absolutely!

And Happy New Year to you all.
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Old 31st December 2009, 11:12 PM   #13792
Glenn2 is offline Glenn2  United Kingdom
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Originally Posted by poynton View Post
You're not alone !!


Andy

.
In my case it's the HMRC and the chancellor to blame. (The standard rate VAT change...)

And to rub salt into the wounds, everything will be 2.5% dearer when I get up in the morning. (Well, 2.17% actually.)

Grrrr...
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Old 1st January 2010, 01:23 AM   #13793
poynton is online now poynton  United Kingdom
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Originally Posted by Glenn2 View Post
In my case it's the HMRC and the chancellor to blame. (The standard rate VAT change...)

And to rub salt into the wounds, everything will be 2.5% dearer when I get up in the morning. (Well, 2.17% actually.)

Grrrr...
Except "lower" priced housing which also got more expensive with the adjustment in stamp duty.

It's all to help the recovery in the economy, don't you know?

Andy

.
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Old 1st January 2010, 03:59 AM   #13794
rfbrw is offline rfbrw
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Originally Posted by poynton View Post
You're not alone !!


Andy

.
Clear skies, azure seas and 30 degrees centigrade. Nice work if you can get it.
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Old 1st January 2010, 08:50 AM   #13795
poynton is online now poynton  United Kingdom
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Originally Posted by rfbrw View Post
Clear skies, azure seas and 30 degrees centigrade. Nice work if you can get it.
I know ...

See my other thread ...... http://www.diyaudio.com/forums/loung...ml#post2030831

Andy


.
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Last edited by poynton; 1st January 2010 at 08:56 AM.
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Old 2nd January 2010, 06:44 AM   #13796
quan is offline quan  Australia
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Default Dos

Happy new year to everyone
Finally gathered all the parts for Ray DOS. I got a pretty much minor modded CD63. How do i go about installing it ?.Please some steps by steps advice would be nice-NOOB.
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Old 2nd January 2010, 10:58 AM   #13797
studiostevus is offline studiostevus  Netherlands
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Originally Posted by Glenn2 View Post
Why 7809/7909? If you are using a separate transformer then fair enough.
Series regulators (apart from low drop-out or 'LDO' ones) need 2V-3V overhead to actually regulate, at these currents. See the data sheets.

If you must use fixed regs, use 7808/7908. The input voltage is not really high enough to use 9V regulators. 8V is borderline and they'll drop out of regulation when spinning up, etc., but should be OK when playing. When they drop out due to not enough overhead, the output voltage will dip below the regualted value.

Best is to use LM317/337 and set them to 7-7.5V.

Guess who has to work on new year's eve...
Mmmm.... will it still to put these 7-7.5V regs on the 10V inputs of the servo amps?
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Old 2nd January 2010, 12:14 PM   #13798
Glenn2 is offline Glenn2  United Kingdom
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Originally Posted by studiostevus View Post
Mmmm.... will it still to put these 7-7.5V regs on the 10V inputs of the servo amps?
That is what I am saying, unless I misunderstood your question.

The '10V' supply is usually up around 11V-12V but depends on your line voltage (mine is higher than spec) but dips when loaded. You should actually measure these whilst playing, to see how much you have here. The servo amps are called upon to produce up to 5V but no more. So they need their supplies to be a volt or two over 5V for a little headroom.

If the regulator is 7V, the regulator has at least 2.5V headroom at its input and the servo amp has 2V headroom at its input.
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Old 2nd January 2010, 02:00 PM   #13799
SimontY is offline SimontY  United Kingdom
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I think the negative rail is more pernickety about voltage sag, but it may just seem that way as it comes with a much smaller smoothing cap to "absorb" the demanding pulses.
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Old 2nd January 2010, 02:12 PM   #13800
Glenn2 is offline Glenn2  United Kingdom
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I made mine adjustable as I didn't know at the time if I'd have to raise the reg voltage if the regs were too hot. I added small heatsinks after this pic anyway (note that the heatsinks must not touch each other unless you use insulators!). I ended up bending one reg forwards and one backwards, so I could refit the cross brace. There is of course no need to put them on the same board as each other.
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