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Old 12th February 2005, 09:50 PM   #1
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Default old philips cdp mods

i recently scored an oddball philips cdd462 external cdrom drive for almost nothing..this is based on the older philips 16 bit cd players[cdm4/tda1543]..but with a extra parts thrown into it's white box[serial port on the back,and a few "extra" chips]it appears to work perfectly and really doesn't sound bad playing cd's,much better than i expected actually.can anyone point me at a webpage listing the many mods that were commonly done to these old 16 bit machines?i remember reading about many,but naturally i can't seem to find them now that the info might be of use to me i'm just looking for some ideas and to find out what might apply to this thing
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Old 13th February 2005, 06:58 PM   #2
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Default Re: old philips cdp mods

Quote:
Originally posted by Rodzilla
i recently scored an oddball philips cdd462 external cdrom drive for almost nothing..this is based on the older philips 16 bit cd players[cdm4/tda1543]..but with a extra parts thrown into it's white box[serial port on the back,and a few "extra" chips]it appears to work perfectly and really doesn't sound bad playing cd's,much better than i expected actually.can anyone point me at a webpage listing the many mods that were commonly done to these old 16 bit machines?i remember reading about many,but naturally i can't seem to find them now that the info might be of use to me i'm just looking for some ideas and to find out what might apply to this thing

Hi

I recently modded a Philips CD614, same architecture as you describe

I changed rectifier diodes to Schottky Barier, installed low jitter clock and directly clocked pin 1 of the TDA1543. I also removed the muting transistors and improved the layout and decoupliong around the various chips.

the result i now a player with resolution and transparancy, a pleasure to listen to as also the stress has disapeared

cheers
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Old 15th February 2005, 04:31 AM   #3
Fin is offline Fin
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Hi Guido

Did you go Non-Oversampling?

How did you apply the clock to pin 1 of TDA1543?
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Old 15th February 2005, 12:06 PM   #4
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Quote:
Originally posted by Fin
Hi Guido

Did you go Non-Oversampling?

How did you apply the clock to pin 1 of TDA1543?
Hi Fin

No, I couldn't as a Mitsubishi chip (datashet unknown) was in front, generating oversampled I2S.

Yes, I interrupted the line to TDA1543 pin1 and injected clock directly - result is stunning

cheers
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Old 15th February 2005, 12:54 PM   #5
Bricolo is offline Bricolo  France
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Directly the 11Mhe clock?

Does this only work because the 8x oversampled data is also at 11Mhz (IOW, we can't do this on a non os player)?
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Old 15th February 2005, 05:02 PM   #6
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Quote:
Originally posted by Bricolo
Directly the 11Mhe clock?

Does this only work because the 8x oversampled data is also at 11Mhz (IOW, we can't do this on a non os player)?

Hi

Yes, directly

In case it differs from the crystal clock: You can measure that frequency, buy or build a clock at that frequency and derive the crystal frequency.
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Old 15th February 2005, 06:05 PM   #7
Bricolo is offline Bricolo  France
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With an IC counter?
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Old 15th February 2005, 06:27 PM   #8
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Quote:
Originally posted by Bricolo
With an IC counter?
Hi

Well, with dividers, often you need divide/2 or so, that can be done with a single Dflipflop

Depends on the system
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Old 15th February 2005, 11:39 PM   #9
Bricolo is offline Bricolo  France
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For a non os I2S I think you must divive per 4 (2.8Mhz)
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Old 16th February 2005, 03:37 AM   #10
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Quote:
Originally posted by Guido Tent
Hi Fin

No, I couldn't as a Mitsubishi chip (datashet unknown) was in front, generating oversampled I2S.
Oh yes! Of Course! I remembered the Mitsibushi chip after I had posted.


Quote:
Originally posted by Guido Tent
Yes, I interrupted the line to TDA1543 pin1 and injected clock directly - result is stunning
Is this better than reclocking BCK?
(I am thinking about my Arcam)

Did you reclock any other lines?
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