Philips CD880 mods

Zoran · 13th September 2005, 09:29 AM

Hi
I done some mods on excelent CD880...
one of the mods is non-oversamping mode
*
since i left the I2S output pins of SAA7220 chip float,
is there any need to load them somehow just to make pins unfloat?
*
still I have the clicks ang cracks beetween tracks
even I connected the mute signal from SAA7220 to SAA7210...

Zoran · 15th September 2005, 08:42 AM

problem solved
becouse of the litle bit more complicated
muting network of the Philips CD 880
additional steps has to be applyed...
I done this without original scematic...
little bit exosting to trace the board connections.
Now the clicks and pops between the songs are gone.
If someone interested I can reply details...
Q
still I am interested how to load unconnected I2S pins
from SAA7220 is there need for this anyway, or
the pins can leave N.C. after aplying the NON-oversampling mode?
maybe resistor in series to led diode to 5V PS?
standard TTL pull up resistor?

tmblack · 23rd January 2006, 03:27 PM

How does one do a non oversampling mod on the CD-880?
At the same time I like to put in the KWAK clock circuit.

And is the TDA1641N better than the TDA1641A?
Thanks

Tom

EE

tmblack · 24th January 2006, 03:16 PM

Does anyone know the Torx size screwdriver required to remove the cover on the CD-880 player?

The unit has a very tubby bass.

Tom

EE

tmblack · 29th January 2006, 07:32 PM

Uses T10 Torx btw.
Good DIY project. Has TDA1541A S1, SAA7220/B and SAA7210.

Tom

EE

tubee · 31st January 2006, 04:34 PM

Zoran: if you use it in Nonos, its better to remove the SAA7220, this chip produces a lot of noise on the supply.
I removed a 7220 in a CD640. Muted from uP to Saa7210. (The 880 uses 7310) A kwak 7, a transistor I/V, and some new caps round dac completed the mod. Sound:is

even with no S1 or S2.

I know someone who can probably supply me a S1 in time....

jean-paul · 31st January 2006, 06:46 PM

Quote:

Originally posted by tubee
I know someone who can probably supply me a S1 in time....

I can....

tubee · 31st January 2006, 07:04 PM

well, for how much $$$?

tmblack · 2nd February 2006, 03:47 PM

Maybe someone can elaborate on how to connect the TDA1541A to which SAA7210 lines for the NOS mod.
After removing the SAA7220 and substituting a socket in its place,, I think you would add jumpers from pin 16 to pin 2, from pin 15 to pin 3, from pin 18 to pin 1

Now what to do about EFAB error flag?

If you remove the SAA7220 you will need a master clock.

Tom

EE

poynton · 2nd February 2006, 04:40 PM

Hi.

Tom - try this

http://www.net-audio.co.uk/tda1541nos.html

Cheap, ready made solution.

EFAB - add a '04 buffer and monostable driving a led - watch it light during bad cds.

Isn't there a mod re: supplying the Saa.. with its own power???

Andy

13th September 2005, 09:29 AM	#1
Zoran diyAudio Member Join Date: Jan 2004 Location: Belgrade	Philips CD880 mods Hi I done some mods on excelent CD880... one of the mods is non-oversamping mode * since i left the I2S output pins of SAA7220 chip float, is there any need to load them somehow just to make pins unfloat? * still I have the clicks ang cracks beetween tracks even I connected the mute signal from SAA7220 to SAA7210... __________________ ###

15th September 2005, 08:42 AM	#2
Zoran diyAudio Member Join Date: Jan 2004 Location: Belgrade	problem solved becouse of the litle bit more complicated muting network of the Philips CD 880 additional steps has to be applyed... I done this without original scematic... little bit exosting to trace the board connections. Now the clicks and pops between the songs are gone. If someone interested I can reply details... Q still I am interested how to load unconnected I2S pins from SAA7220 is there need for this anyway, or the pins can leave N.C. after aplying the NON-oversampling mode? maybe resistor in series to led diode to 5V PS? standard TTL pull up resistor? __________________ ###

31st January 2006, 04:34 PM	#6
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Zoran: if you use it in Nonos, its better to remove the SAA7220, this chip produces a lot of noise on the supply. I removed a 7220 in a CD640. Muted from uP to Saa7210. (The 880 uses 7310) A kwak 7, a transistor I/V, and some new caps round dac completed the mod. Sound:is even with no S1 or S2. I know someone who can probably supply me a S1 in time.... __________________ Daisy Bell

31st January 2006, 07:04 PM	#8
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	well, for how much $$$? __________________ Daisy Bell

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23rd January 2006, 03:27 PM	#3
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	How does one do a non oversampling mod on the CD-880? At the same time I like to put in the KWAK clock circuit. And is the TDA1641N better than the TDA1641A? Thanks Tom EE

24th January 2006, 03:16 PM	#4
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	Does anyone know the Torx size screwdriver required to remove the cover on the CD-880 player? The unit has a very tubby bass. Tom EE

29th January 2006, 07:32 PM	#5
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	Uses T10 Torx btw. Good DIY project. Has TDA1541A S1, SAA7220/B and SAA7210. Tom EE

2nd February 2006, 03:47 PM	#9
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	Maybe someone can elaborate on how to connect the TDA1541A to which SAA7210 lines for the NOS mod. After removing the SAA7220 and substituting a socket in its place,, I think you would add jumpers from pin 16 to pin 2, from pin 15 to pin 3, from pin 18 to pin 1 Now what to do about EFAB error flag? If you remove the SAA7220 you will need a master clock. Tom EE

2nd February 2006, 04:40 PM	#10
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. Tom - try this http://www.net-audio.co.uk/tda1541nos.html Cheap, ready made solution. EFAB - add a '04 buffer and monostable driving a led - watch it light during bad cds. Isn't there a mod re: supplying the Saa.. with its own power??? Andy

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