Help me mod Philips CD960

@lf · 8th December 2006, 11:58 AM

Hi,

Here is shematics for analog out:

@lf · 8th December 2006, 12:06 PM

Here is shematics for modded analog out I found on the internet:

@lf · 8th December 2006, 12:09 PM

Here is another shematics for analog out:
I need opinion/explanation of this mods before I start desoldering.
Does anyone have any other suggestions for modding analog out?

I will post power supply shematics also.

poynton · 8th December 2006, 12:26 PM

Hi

Neither will work !

Andy

@lf · 8th December 2006, 08:53 PM

Quote:

Hi

Neither will work !

Andy

There is mistake in first shematic. Here is correct one.

Any other who can comment these mods or have suggestion for different approach?

What about 14 220n caps on TDA1541A?

@lf · 8th December 2006, 09:15 PM

I removed 100uF cap and CDP has much more detail and better bass now.

Bernhard · 9th December 2006, 02:55 PM

You could try to remove the 2,2n slew rate limitation cap.
And the 22n cap on the output.

The first resistor with red X is for DAC current offset compensation, removing it will cause DC offset on output if 100µF is removed.
The middle part is the analog filter, gives lot of HF when removed because of 4x oversampling.

Try change the 14 decoupling caps for higher quality/value,
1k78 I/V resistor for better quality,
better op amps + better decoupling caps.

Upgrade to S1 chip + SAA7220B perhaps.

@lf · 10th December 2006, 02:26 PM

Quote:

You could try to remove the 2,2n slew rate limitation cap.
And the 22n cap on the output.

Which one? (see red circles in shematic)

Quote:

Try change the 14 decoupling caps for higher quality/value,

Higher value is =

I have at hand only 100n WIMA MKP

[/QUOTE]
1k78 I/V resistor for better quality,
better op amps + better decoupling caps.

Do you have any reccomendation (KIWAME, VISHAY)?

I have AD825 OP AMPS. Any other/better choice you can reccomend?

Quote:

Upgrade to S1 chip + SAA7220B perhaps.
cap.

I have SAA7220B, S1 and S2 chip. I replaced TDA1541A with S1 (for S2 I'm not sure is it original or not) and player has more detail and better sound now.

THANK YOU for your replay

@lf · 10th December 2006, 02:31 PM

correct one

Bernhard · 10th December 2006, 02:35 PM

Quote:

Originally posted by @lf
[B]
Which one?

The 2,2n below the I/V resistor.

Quote:

Originally posted by @lf
[B]
Do you have any reccomendation (KIWAME, VISHAY)?

Maybe just make sure they are not magnetic.
Or Vishay ?

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8th December 2006, 12:26 PM	#4
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Hi Neither will work ! Andy

9th December 2006, 02:55 PM	#7
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	You could try to remove the 2,2n slew rate limitation cap. And the 22n cap on the output. The first resistor with red X is for DAC current offset compensation, removing it will cause DC offset on output if 100µF is removed. The middle part is the analog filter, gives lot of HF when removed because of 4x oversampling. Try change the 14 decoupling caps for higher quality/value, 1k78 I/V resistor for better quality, better op amps + better decoupling caps. Upgrade to S1 chip + SAA7220B perhaps.

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