PSX clock for CD Player use

pozo1992 · 13th October 2004, 08:31 AM

Hi there,

I am dealing with both, CD player mods and playstation tuning. So recently I had the idea to combine both worlds, i.e. to use the PSX 67.737MHz oscillator as part of a clock generator for my pioneer CD player. The nice thing about the PSX clock is that it has four times the frequency of my CD player (16.9344MHz). Now by dividing the PSX clock by four using two toggle flipflops of ACT type I could get a decent clock for my CD.

My plan is the following: Desolder the oscillator from the PSX, add a 74ACT74 and some means for supplying these and try with my pioneer CD. Intention is to make the circuit as small as possible with very short interconnections using SMD components. Remember we are dealing with very high frequencies.
First measurements on the oscillator are encouraging: Frequency accuracy is fine, 1ppm!!!
The manufacturer of the PSX oscillator is KDS.

Anyone tried this? Please comment. I´LL keep you updated.

p.s.: Did I discover the source of the "PSX sound"?

pozo1992 · 25th October 2004, 07:19 AM

Hi gents,

now I have the first prototype running. Attached you can see a pic of it.
It measures very well: Inital accuracy: 16.934375MHz which is approx. 2.5ppm. Rise and fall times are around 2ns. Please see also the two attached scope pics. Please note the special arrangement for attaching the scope probes in order to get accurated results.
The supply delivers 3.3V for the PSX oscillator and 5.0V for the 74ACT74 gates. It is based on a TL431 circuit with NPN transistor.
So far I did not test the impact on the sound. Later I intend to use it in my Pioneer PD-S802 and test the sound against a KC7 clock and one of my own creations.

pozo1992 · 25th October 2004, 07:20 AM

More pics:

pozo1992 · 25th October 2004, 07:22 AM

And a last the 67MHz oscillator signal before and after the 47R coupling resistor:

Nanook · 9th November 2005, 04:04 AM

er how does it sound. I don't know the jitter of the 802 or 54 . I have a PD-54 which is essentially a 802 ..

Elso Kwak · 9th November 2005, 06:17 AM

use some modern logic family ACT yeck...

pozo1992 · 10th November 2005, 01:21 PM

Hi Nanook,

first of all: Each of the clock circuits I have tried in place of the original one were better than it. The most important thing is to omit the HCMOS IC that is distributing the clock signal among the DACs and the decoder chip. The clock is able to drive them without effort. Done that its difficult for me to hear a significant difference between the tested clock circuits. My intention about the PSX clock was to see how far you can go in terms of technical optimisation and what I can personally hear.
So after all its a matter of taste.....

13th October 2004, 08:31 AM	#1
pozo1992 diyAudio Member Join Date: Jun 2004 Location: Bavaria	PSX clock for CD Player use Hi there, I am dealing with both, CD player mods and playstation tuning. So recently I had the idea to combine both worlds, i.e. to use the PSX 67.737MHz oscillator as part of a clock generator for my pioneer CD player. The nice thing about the PSX clock is that it has four times the frequency of my CD player (16.9344MHz). Now by dividing the PSX clock by four using two toggle flipflops of ACT type I could get a decent clock for my CD. My plan is the following: Desolder the oscillator from the PSX, add a 74ACT74 and some means for supplying these and try with my pioneer CD. Intention is to make the circuit as small as possible with very short interconnections using SMD components. Remember we are dealing with very high frequencies. First measurements on the oscillator are encouraging: Frequency accuracy is fine, 1ppm!!! The manufacturer of the PSX oscillator is KDS. Anyone tried this? Please comment. I´LL keep you updated. p.s.: Did I discover the source of the "PSX sound"?

9th November 2005, 04:04 AM	#5
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	pozo, how does it sound? er how does it sound. I don't know the jitter of the 802 or 54 . I have a PD-54 which is essentially a 802 .. __________________ stew ☮ -"A sane man in an insane world appears insane."

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9th November 2005, 06:17 AM	#6
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	use some modern logic family ACT yeck...

10th November 2005, 01:21 PM	#7
pozo1992 diyAudio Member Join Date: Jun 2004 Location: Bavaria	Hi Nanook, first of all: Each of the clock circuits I have tried in place of the original one were better than it. The most important thing is to omit the HCMOS IC that is distributing the clock signal among the DACs and the decoder chip. The clock is able to drive them without effort. Done that its difficult for me to hear a significant difference between the tested clock circuits. My intention about the PSX clock was to see how far you can go in terms of technical optimisation and what I can personally hear. So after all its a matter of taste.....

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