[time-nuts] quartz crystal configuration in small cases

[ALAN MELIA]

Hi Atilla, I dont have book availabe but AT cut is a thickness-shear vibration mode so plate area may not be an issue ?? Just harder to make :-))
Alan

--- On Tue, 13/3/12, Attila Kinali <attila at kinali.ch> wrote:

> From: Attila Kinali <attila at kinali.ch>
> Subject: [time-nuts] quartz crystal configuration in small cases
> To: time-nuts at febo.com
> Date: Tuesday, 13 March, 2012, 17:26
> Hi,
> 
> I have been reading up on quartz crystal oscillators in the
> past few
> weeks. Something that i couldn't figure out until now is
> what kind of
> configuration the small crystals use.
> 
> If you read all those documents on quartz, they all show the
> oscillator
> "core" as a round plate, approximately 1.4cm diameter, one
> side, maybe
> both sides rounded (like [1]). That's all nice and good, but
> those
> crystalls fit only into the large cases. Even a HC-49/US has
> not enough
> space for such a plate. And the SMD cases are even worse.
> 
> Unfortunately, my google skills failed me on finding any
> information
> on how the configuration of the crystal in those small cases
> look like
> and what oscillation modes they use.
> 
> Would someone be so kind and give me a few pointers on
> this?
> 
> Thanks in advance
> 
>            
> Attila Kinali
> 
> [1] http://flaggedrevs.labs.wikimedia.org/wiki/File:InsideQuartzCrystal.jpg
> 
> 
> -- 
> The trouble with you, Shev, is you don't say anything until
> you've saved
> up a whole truckload of damned heavy brick arguments and
> then you dump
> them all out and never look at the bleeding body mangled
> beneath the heap
>         -- Tirin, The
> Dispossessed, U. Le Guin
> 
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