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Old 26th January 2011, 07:55 PM   #11
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Today i spent a little time at my cd-471..
I put copperfoil on the 3 biggest chips and couple it to ground with ceramics caps.
I tought it was voodoo to put some coppershield on the chips... but i must admit, that it works very well!
The dynamics seems to be improved. I'm happy with it!
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Old 26th January 2011, 08:58 PM   #12
amc184 is offline amc184  New Zealand
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I drew up a diagram on how to connect an external power supply to the SAA7220, it's a pretty easy job. A couple of caveats though:

- Make sure your supply is actually putting out +5VDC, or at least very close to that.
- The SAA7220 is going to burn through 180mA while operating, make sure your supply can actually handle that.
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Old 26th January 2011, 09:02 PM   #13
amc184 is offline amc184  New Zealand
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Oh, and I almost forgot, you'll have to ground the supply as well of course! Use that grounded link labeled 116 on the diagram.
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Old 27th January 2011, 03:54 PM   #14
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Quote:
Originally Posted by amc184 View Post
I drew up a diagram on how to connect an external power supply to the SAA7220, it's a pretty easy job. A couple of caveats though:

- Make sure your supply is actually putting out +5VDC, or at least very close to that.
- The SAA7220 is going to burn through 180mA while operating, make sure your supply can actually handle that.

This is great! Thanx.
I'm gonna start with a standard lm7805. after that i have some burson audio super reg for further improvement. Maybe i put a alwsr super reg on this chip.
I want to put seperate toroids for the chips like saa7220p/b, saa7210, tda1541A. I'm searching for 30 or 50 va toroids because this fit into the case.
Probably is 2 toroids the max for this player, but i have to measure that.

Capacitor 2605 is already changed for a sanyo oscon 47uf/16v.
Is this good enough? I have some panasonic fc/fm lying around.

pics later...

Last edited by Magura456; 27th January 2011 at 03:56 PM.
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Old 27th January 2011, 07:17 PM   #15
amc184 is offline amc184  New Zealand
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The Sanyo OSCON should be fine.
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Old 10th March 2011, 08:51 PM   #16
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This week i build a psu with a low noise regulator from Burson for the saa7220p/b. Improvement all the way
The transformer is 2x15v 30va, schottky diodes, lm7812,rubycon zlh+zl 1000uf caps with burson super reg.

Thanx amc184
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Old 19th March 2011, 04:27 PM   #17
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This is only test setup. I need to rebuild the circuit a lot smaller.
Next step is a second psu for the saa7210 or tda1541A.
It plays already very nice.
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File Type: jpg P1010021.JPG (860.2 KB, 295 views)
File Type: jpg P1010027.JPG (843.9 KB, 278 views)
File Type: jpg P1010024.JPG (844.9 KB, 261 views)

Last edited by Magura456; 19th March 2011 at 04:36 PM.
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Old 19th March 2011, 11:30 PM   #18
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You are sure that you did hear improvements or it is just a wishfull autosugestion?
SAA7220 is a crappy/jittery OS/filter cip by today standards, I cannot see how you can improve it with just a power supply.
I can admit something like that for the TDA1541... but even there I would be doubtfull.
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Old 20th March 2011, 03:51 AM   #19
amc184 is offline amc184  New Zealand
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It's just as much about improving the supply to the rest of the player. The SAA7220 is a power hungry IC and very noisy, and tends to contaminate the power supply to the rest of the player. Did you actually do much of a comparison Magura?

By the way SoNic_real_one, you have a lot of harsh words about the SAA7220, especially its jitter performance. What measurements are you basing your criticism on?
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Old 20th March 2011, 09:34 PM   #20
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Quote:
Originally Posted by SoNic_real_one View Post
You are sure that you did hear improvements or it is just a wishfull autosugestion?
SAA7220 is a crappy/jittery OS/filter cip by today standards, I cannot see how you can improve it with just a power supply.
I can admit something like that for the TDA1541... but even there I would be doubtfull.
Hi,

Yes, its not a totally different sound but more subtle improvement.
With the shiga clone psus i noted differences like more "relaxed" sound.
So i build a psu with a low noise super reg to test it with this player.
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