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Old 25th September 2006, 07:12 PM   #1
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Default Clocking the CDM-Pro2

Anyone have had any expirience with doing that ?

I'm torn between LC Audio X03, Telt Labs X03, AudioCom Clock 3 and Trichord Clock 4 (and their respective power supplies).

Any ideas ?
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Old 25th September 2006, 11:50 PM   #2
loddie is offline loddie  United States
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Not to hijack the thread, but has anyone added wordclock input to the CDpro2?
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Old 26th September 2006, 02:03 PM   #3
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Hi,

I made something like that using a x3 clock multiplier available in the market.

I made a tweak on the cd-pro2 to make it run from a 33.8688Mhz clock and then feed my 11.2896Mhz DAC clock to the multiplier and then to the cd-pro2.

it works perfectfully !
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Old 26th September 2006, 02:21 PM   #4
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Quote:
Originally posted by apolon34
I made a tweak on the cd-pro2 to make it run from a 33.8688Mhz clock
Can you provide some details of that tweak?

That would be very useful for my ML31.5 transport that uses CDM12 IND with 33.8688Mhz clock which is not compatible with CD-Pro2 (for mechanism swaping).
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Old 26th September 2006, 07:29 PM   #5
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Hi,

The tweak is very simple, I just tied the SELPLL input pin of the SAA to ground. Originally, it has a pull-up resistor to VCC so you can leave it in place without problems and without the need to cut traces.
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Old 27th September 2006, 09:38 PM   #6
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Quote:
Originally posted by apolon34
Hi,

The tweak is very simple, I just tied the SELPLL input pin of the SAA to ground. Originally, it has a pull-up resistor to VCC so you can leave it in place without problems and without the need to cut traces.
I guess you solder the external clock where the original oscillator is mounted.

How did you remove the original crystal oscillator from the CD-PRO2 PCB? The picture shows how it is done for a CDM12 IND.

Could you mail a picture of the mod on CD-PRO2?
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Old 27th September 2006, 10:28 PM   #7
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It's been described here; http://www.diy-high-end.com/cd/page25.html
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Old 28th September 2006, 01:12 AM   #8
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Hi,

This was what I did. I pulled out the 8.xxx mhz oscillator & soldered the leads of the aftermarket clock to the respective points shown in the pic.

Regards,
Joe Ling

PS : The clock used is a kwak clock 7
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Old 28th September 2006, 06:39 AM   #9
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I removed the original xtal completely.
For that you need to unsolder the 4 pads of the original crystal.

An improvement is that you don't need to remove the two caps near the crystal cause the 4 pads package makes a bridge between the caps and the SAA.

for the ground, I juste scratched a bit the pcb to see the copper and then soldered the ground on it.
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Old 28th September 2006, 11:13 AM   #10
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I will use an external Madrigal clock and swap CMD12 IND (SAA7345) with CD-PRO2M (SAA7324). However, the supply voltage of SAA7345 is 5.0 V and the supply voltage of SAA7324 is 3.3 V. Since the chip on CD-PRO2M runs on 3.3V do I need to mount a resitor in parallel between the wires? If so what should the resistanse be??
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