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Old 9th December 2010, 02:54 PM   #1
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Join Date: Jul 2004
Location: Hong Kong
Default Is this a better clock?

I have a DIY CDPro2 Transport purchased from hifidiy dot net. It has been running in my system for 1.5 years. It went through a number of modifications over the span of service on power regulator by changing the LM317 to LT1085 then to DEXA UWB regulators then to adding DEXA UWB regulators for individual parts (oscillator, TL etc.). I can denote improvement on every modification and is totally satisfied with it. Yet, even without any modification, this DIY transport blows away my CEC TL51X transport which is about the same cost. After the latest modification, it even blows away a Wadia 8.

I think it is time to try out the clock. I borrowed a clock from my friend and tried but I cannot get it working. I think I need some time to find out the reason. I also measured the output but the waveform looks alike between the original oscillator and the clock. Is there any way to denote which could be the better alternative?

The original oscillator output
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File Type: jpg CDPro2 Clock.JPG (120.1 KB, 173 views)

Last edited by Sunsun22; 9th December 2010 at 03:00 PM.
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Old 9th December 2010, 02:55 PM   #2
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This is the output from the clock (

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File Type: jpg External clock.JPG (126.4 KB, 170 views)
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Old 9th December 2010, 05:47 PM   #3
DF96 is offline DF96  England
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Join Date: May 2007
Your new clock looks more noisy than the old one!

Anyway, the (perceived) issue with clocks is jitter. Jitter has to be quite bad before it is visible on an oscilloscope display. You need some fancy test gear to measure jitter.
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Old 9th December 2010, 09:50 PM   #4
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Join Date: Feb 2003
It there DC in your friend's clock? In some cases, the players stop work with DC clock signal. Try to add a coupling cap at the output of your friend's clock.
Here's looking at you, kid.
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