[time-nuts] quartz crystal configuration in small cases

[Bob Camp]

Hi

The typical AT low cost crystal is an AT strip. It's rectangular rather than
circular. It still resonates across the thickness dimension, just as the
circular part does. 

A modern 32 KHz crystal is set up as a tuning fork.  The resonance happens
each "arm" along it's length. Long ago 32 KHz crystals were made as strips
that resonated along the length of the strip. A part that resonates along
it's length is often called a bar in the literature.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of ALAN MELIA
Sent: Tuesday, March 13, 2012 4:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] quartz crystal configuration in small cases

hi Magnus the only "bar" resonators I have actually seen were NT flexural
bar. Modern cuts probably include all sorts of resonator modes....but are
these AT cuts?

Alan

--- On Tue, 13/3/12, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> From: Magnus Danielson <magnus at rubidium.dyndns.org>
> Subject: Re: [time-nuts] quartz crystal configuration in small cases
> To: time-nuts at febo.com
> Date: Tuesday, 13 March, 2012, 17:59
> On 03/13/2012 06:35 PM, ALAN MELIA
> wrote:
> > 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 :-))
> 
> One of the AT cut oscillators I use has a crystal bar rather
> than a circular plate. Being mass-produced in bulk, etched
> etc. It is just a different process.
> 
> I'm sure the crystal oscillator folks here could point to
> some good sources on that.
> 
> Cheers,
> Magnus
> 
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