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Old 20th June 2004, 03:00 AM   #1
hacknet is offline hacknet  Singapore
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Default Clocks

i`ve wanted to modify my cdplayer recently and have been advised to change the onboard 11mhz clock to a lower PPM one. how do i identify a lower ppm one? is there anything on the clock body that i can make assumtions from?

Thanks!
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Old 20th June 2004, 03:04 AM   #2
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Default Lower PPM has nothing to do with it.....

It has to do with lower jitter, and the design criteria for the two are different.

Several guys have kits or similar stuff that you can buy, including just PCBs.

Jocko
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Old 20th June 2004, 06:02 AM   #3
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If you want to replace the oscillator there are two products on the market.

Tentlabs www.tentlabs.com

and LCAudio
http://www.lcaudio.dk/com/index.php?...8f4bca00c416fe


Which is the best? We have had and long long thread about this but we couldn't come to any conclusion. LCAudio's look coolest with 4-layer pcb and a blue LED!
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Old 20th June 2004, 08:04 AM   #4
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Lightbulb Clocks

Hi Hacknet,
Well there is also the Audiocom clock, the Trichord clock, the Netaudio clock, the clocks from www.audiotuning.de , the Gruensch clock www.gruensch.de , the French Maxi clock by Antileon http://www.tnt-audio.com/clinica/antileon_e.html , the G & D Transforms clock I never did get hold of, the K.K. Ho clock from Hong-Kong, Jocko's DIY clock as posted on this forum and the DIY KWAK-CLOCK. You can download the schematic here:
http://www.diyaudio.com/forums/showt...928#post199928
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Old 20th June 2004, 08:17 AM   #5
hacknet is offline hacknet  Singapore
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thanks. is there any other way instead of building these circuits?
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Old 20th June 2004, 08:19 AM   #6
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Default Building?

Quote:
Originally posted by hacknet
thanks. is there any other way instead of building these circuits?
Except the latter two all other clocks are ready built. This is a DIY forum.
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Old 20th June 2004, 09:01 AM   #7
hacknet is offline hacknet  Singapore
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I was hoping for drop in replacements... eg, a lower ppm clock that i could just use to replace the original one.
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Old 20th June 2004, 09:16 AM   #8
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Post Drop in Replacement

Quote:
Originally posted by hacknet
I was hoping for drop in replacements... eg, a lower ppm clock that i could just use to replace the original one.
Hi Hacknet,
I am sorry but I am afraid you confuse the crystal with the clock.
A clock is a crystal oscillator consisting of a crystal, a active circuit with a transistor or FET and very often a low noise power supply regulator.
I know of the AhTjoeb offering a low jitter crystal whatever that may be. As Jocko said low ppm does not say anything; low jitter, low frequency deviation......? In my experience the active circuit is much more important than the crystal. Also a SC-cut crystal that seems to be the best for low jitter is VERY expensive, something like US$ 120.
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Old 20th June 2004, 10:27 AM   #9
hacknet is offline hacknet  Singapore
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oh... okay... now i understand... i think i`ll go ahead with the kwak 7. thanks!
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Old 21st June 2004, 08:52 AM   #10
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Default Re: Building?

Quote:
Originally posted by Elso Kwak

Except the latter two all other clocks are ready built. This is a DIY forum.

Hi

The heart of the TentLabs clocks is available for DIY as well

cheers
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