External clock to CD-PRO2

kenev · 1st July 2003, 04:55 PM

Has anyone replaced the onboard oscillator of the CD-PRO2 unit with an external low jitter clock?
I have searched the forum but didn' t manage to find something about this. There was a post somewhere regarding this issue, but things were not clear.
Reading the manual of the CD-PRO2 I find that there is a connector with the designation "16 MHz (optional)", but, as far as I understand this, ths is for providing the internal 16 MHz clock to an external unit.
I' m interested in building a KWAK-CLOCK and feeding my unit with it.
What I' m asking is where should I connect the clock (and from where should I disconnect the onboard clock). Has anybody some kind of experience with such a modification?

Evangelos

Guido Tent · 6th July 2003, 03:38 PM

Quote:

Originally posted by kenev
Has anyone replaced the onboard oscillator of the CD-PRO2 unit with an external low jitter clock?
I have searched the forum but didn' t manage to find something about this. There was a post somewhere regarding this issue, but things were not clear.
Reading the manual of the CD-PRO2 I find that there is a connector with the designation "16 MHz (optional)", but, as far as I understand this, ths is for providing the internal 16 MHz clock to an external unit.
I' m interested in building a KWAK-CLOCK and feeding my unit with it.
What I' m asking is where should I connect the clock (and from where should I disconnect the onboard clock). Has anybody some kind of experience with such a modification?

Evangelos

Hi

If you have a circuit diagram, I could be of help

Most logical you feed the new clock to the input of the original crystal oscillator (after removing the crystal ofcourse)

By the way, my most recent measurements on a Kwak clock showed horrible results.

best regards

Guido

Peter Daniel · 6th July 2003, 04:02 PM

Here's some info I found in CD-Pro documentation

Elso Kwak · 6th July 2003, 05:07 PM

Hi Evangelos,
You almost answered your own question.
Just remove the original crystal and the two small caps as in the picture kindly provided by Peter.
You now have to connect the output of the KWAK-CLOCK to one of the pads of the original crystal connected to CRIN.
If you can not determine from the schematic wich pad is connected to CRIN just try both pads, one at a time, with a 1k resistor in series wth the clock-output. Keep the pad that works and remove the 1k resistor.
I hope to visit your beautiful country soon.....

Lupulroz · 6th July 2003, 10:01 PM

I've made that modification. I don't remember what pin is the right one but this is critical. One of my SAA7324 died in this experiment

so take care, the chip is very sensitive.
My Philips dealer said it cannot provide this chip even if I wanted 1000 pcs.

I will look and tell you about the real clock input.

jean-paul · 6th July 2003, 10:05 PM

Quote:

Originally posted by Guido Tent

Hi

If you have a circuit diagram, I could be of help

Most logical you feed the new clock to the input of the original crystal oscillator (after removing the crystal ofcourse)

By the way, my most recent measurements on a Kwak clock showed horrible results.

best regards

Guido

Hi Guido, horrible in what sense ? Jitter, waveform ? I heard/read quite some good responses on Elso's clock.

Peter Daniel · 6th July 2003, 10:05 PM

So did you complete the modification or the loss of a chip made your unit useless?

Lupulroz · 6th July 2003, 10:18 PM

I completed the modification on other units. Of course the one with dead SAA it's useless until the chip is replaced.

Peter Daniel · 6th July 2003, 10:22 PM

What clock frequency did you use? From info I posted it seems like at least 3 different frequencies are possible.

Lupulroz · 6th July 2003, 10:35 PM

I used 8.4672 MHz external clock - ECL type with discrete buffer.

1st July 2003, 04:55 PM	#1
kenev diyAudio Member Join Date: Oct 2002 Location: Athens, Greece	External clock to CD-PRO2 Has anyone replaced the onboard oscillator of the CD-PRO2 unit with an external low jitter clock? I have searched the forum but didn' t manage to find something about this. There was a post somewhere regarding this issue, but things were not clear. Reading the manual of the CD-PRO2 I find that there is a connector with the designation "16 MHz (optional)", but, as far as I understand this, ths is for providing the internal 16 MHz clock to an external unit. I' m interested in building a KWAK-CLOCK and feeding my unit with it. What I' m asking is where should I connect the clock (and from where should I disconnect the onboard clock). Has anybody some kind of experience with such a modification? Evangelos

6th July 2003, 05:07 PM	#4
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	New clock in CD-PRO Hi Evangelos, You almost answered your own question. Just remove the original crystal and the two small caps as in the picture kindly provided by Peter. You now have to connect the output of the KWAK-CLOCK to one of the pads of the original crystal connected to CRIN. If you can not determine from the schematic wich pad is connected to CRIN just try both pads, one at a time, with a 1k resistor in series wth the clock-output. Keep the pad that works and remove the 1k resistor. I hope to visit your beautiful country soon.....

6th July 2003, 10:05 PM	#7
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	So did you complete the modification or the loss of a chip made your unit useless? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

6th July 2003, 10:22 PM	#9
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	What clock frequency did you use? From info I posted it seems like at least 3 different frequencies are possible. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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6th July 2003, 10:01 PM	#5
Lupulroz diyAudio Member Join Date: Apr 2003 Location: Mars	I've made that modification. I don't remember what pin is the right one but this is critical. One of my SAA7324 died in this experiment so take care, the chip is very sensitive. My Philips dealer said it cannot provide this chip even if I wanted 1000 pcs. I will look and tell you about the real clock input.

6th July 2003, 10:18 PM	#8
Lupulroz diyAudio Member Join Date: Apr 2003 Location: Mars	I completed the modification on other units. Of course the one with dead SAA it's useless until the chip is replaced.

6th July 2003, 10:35 PM	#10
Lupulroz diyAudio Member Join Date: Apr 2003 Location: Mars	I used 8.4672 MHz external clock - ECL type with discrete buffer.

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