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Old 3rd November 2006, 07:31 PM   #4491
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by Malefoda
Guys,
I've opened a new threat (sorry Simon I've quoted you and they do not agree...)
lol, I talk too much!

I was going to mod but I've got some Queen on and it's quite captivating!
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Old 4th November 2006, 06:50 AM   #4492
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Quote:
Originally posted by SimontY
With this article fresh in mind does anyone have any opinions on the usefulness of making the ground line on the regulator boards extra thick? I assume the lower the resistance the less the problem. I could add a copper wire along all of it and solder it all up with lots of solder, reducing the "parasitic resistance" of the ground paths to something very low. That should reduce the noise.
Simon, The best ground wire you can possibly use is a flat braid as the main earth, usually you can achieve this by striping the outer braid of some RG58 coax for instance, slide a sleeve over it for electrical protection, and take it to your prefered earth. The resistance may look the same, however, to RF & noise, the resistance and inductance is a little better.

For strip board, you may fancy "weaving" along one strip so a wire is present on the top of the board, say spaced 3 holes apart, you then have access to the ground wire on both sides if its usefull. Comes in handy when experimenting.

If you are carefull, and neat enough you can also make a ground plane on top of strip board with the stick on copper sheild, just pop a neat hole sufficient in size so as not to short anything out for component legs, alternativly, just "wack" some ground strips in blank places if there is any room. Experiment as sometimes any extra capacitance may have undesired effects.

Im trying some more mods to day (soldering iron willing!) and maybe post some pics as i havnt shown any yet lol.
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Old 4th November 2006, 09:54 AM   #4493
SimontY is offline SimontY  United Kingdom
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Thanks for the tips! I might have a go with that super ground wire at some point, but I'm not going to redo all the old ones.

I did a little unplugging last night and it seems my hum is coming from within the power amp itself, mainly. The cd player's noise could do with being reduced though.

Sounding good though

Simon
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Old 4th November 2006, 10:57 AM   #4494
awpagan is offline awpagan  Australia
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simon

test if the hum is from the cdp or something else connected.
It may be from the player then amplified with the amp or
from something else.

It can be caused by other components connected.

allan

ps
Yes they can be a pain in the butt to track down>
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Old 4th November 2006, 05:14 PM   #4495
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Hey afterall Ray got me working!
Look how much things he made me change!
Click the image to open in full size.
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Old 4th November 2006, 05:27 PM   #4496
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Looks like "Blanket Bombing!"
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Old 4th November 2006, 05:37 PM   #4497
adfinni is offline adfinni  United Kingdom
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Well im off to see we are scientists tonight at rock city, which is something even the best modded 63 can't reproduce off the cd. Then fireworks at a massive houseparty.

Il try and post when i get back in a horrific state


Lol dennis, watch out for flying caps lads and........

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Old 4th November 2006, 06:41 PM   #4498
SimontY is offline SimontY  United Kingdom
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Nice.

I did some more work today....

1 - removed grounds from each wire that feeds the reg boards from the external psu

2 - soldered a thick wire from the external psu ground star to the cd player's ground star

3 - added a disconnecting network of 8.2R and 22nF (in parallel) in line with the star to safety earth in the external psu

4 - cut the ground on each main reg board before the reg and made another return to a mini star point on the reg boards

5 - soldered good ground wires from each reg board to the cdp star

So, to clarify, there's now one "master" ground connection, which is the only ground wire between the cdp and external psu.

Objectively, noise appears to have reduced a little, although there is still a slight squeal and some broadband noise. There is hum, which seems to be a power amp problem (no difference with cdp connected or not).

Subjectively, the music sounds fantastic. Even more dynamic with a lower noise floor.

Black Gates to go in soon!

Simon
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Old 4th November 2006, 07:02 PM   #4499
jvdberg is offline jvdberg  United States
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Default R149, R150, R164, R165 missing

Hi,

I've a CD63SE giving an Err02 error intermittently.

Opened up the player, but R149, R150, R164, R165 are missing from the main PCB and has been replaced by wire "bridges". I've compared it to a CD53 and all the mentioned resistors are indeed in place.

Is this normal on a CD63SE model not to have these resistors populated? What would the reasoning be behind such a mod?

Sorry I'm a bit of a noob with this ...

Thanks,
Johan
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Old 4th November 2006, 07:44 PM   #4500
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Quote:
Well im off to see we are scientists tonight at rock city, which is something even the best modded 63 can't reproduce off the cd. Then fireworks at a massive houseparty.
LOL! Is Rock City still going then? Fantastic, many great nights spent there...

- Martin
BA (Architecture&Env Design) Nottm 89-92, B.Arch Nottm 93-95...

PS. getting there, these days - horns are your friends
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