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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
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Old Yesterday, 07:26 PM   #3101
WTS is offline WTS  Canada
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Originally Posted by sebbyp View Post
Sounds really interesting, would you be happy to share some of the experiments you have done for future implementers of Andrea's clocks, who may not have the time to iteratively test different dampening methods?
Actually it has been my partner(crwalpole) who has done most of the vibration isolation experiments. But some of what we did was just using grey putty on the boards or bees wax and then mounting them in diecast boxes. His last one was built in an aluminum enclosure which was built out of 0.75" thick aluminum and inside he had springs to suspend it from and I believe the board was actually weighted to stretch the springs slightly.

There's many ways you can come up with to add some vibration isolation to these boards. I would get some grey putty(get putty that doesn't harden over time) and just put 0.5" of it on the backside of the board and then stand the crystal up(90* from the board) and pack some putty on it too. Then mount it in a diecast enclosure, you could then even mount it with soft rubber feet to whatever enclosure you use for your system boards.

Did any of this make a difference in the sound quality, yes and maybe.
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Old Yesterday, 08:11 PM   #3102
gerhard is offline gerhard  Germany
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Originally Posted by tom59hifi View Post
Hi Gerhard,

I forgot to ask if you know what is the minimum quantity for ordering crystals at Quartztechnik .
A friend of mine is asking.

Cheers
They used to make channel crystals for hams, but 1 or 5 is more or less the same work.
Ask THEM and tell us :-)

Kontakt - Quarztechnik Daun

Gerhard
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Old Yesterday, 08:23 PM   #3103
tom59hifi is offline tom59hifi  Croatia
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Thank you.I will.
Cheers

Tomislav
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Old Today, 01:31 AM   #3104
wlowes is offline wlowes  Canada
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Default vibration

Lots of great ideas for vibration dampening. In my experience, well worth the effort. I have had clear improvements in sound whether it is simple like putty on the crystal to quite comprehensive as I have with Andre's WTMC. My approach documented earlier. The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator Perhaps some inspiration. Sand works well combined with large masses separated by dampening layers.
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Old Today, 04:18 AM   #3105
1audio is offline 1audio  United States
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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
Vibration sensitivity for crystal oscillators is something you can research. Wenzel has some good info but keep in mind the vibration levels they are dealing with are much higher.
It's known that the crystal frequency is sensitive to position and turning it over will change the frequency. Certain axis is will have the high sensitivity.
As to vibration, if you don't want to create active correction (see the Wenzel article), then it's best to figure out the sensitive frequency of the system and design isolation around that. It's similar to turntable isolation. More mass, more compliance and make sure you have no suspension resonances that match sensitive frequencies.
You may be able to connect the crystal to a high Z input with lots of gain and directly see it's vibration sensitivity. Its pretty similar to a piezo accelerometer. And there may be microphonics in the rest of the electronics.
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Old Today, 07:09 AM   #3106
TNT is offline TNT  Sweden
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Aah - you say that the impedance that the crystal see has an effect on the damping of the crystal? The good ol' amp-speaker relation again in disguise?

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