[time-nuts] quartz crystal configuration in small cases

Javier Herrero jherrero at hvsistemas.es
Tue Mar 13 21:07:24 UTC 2012


Hello,

AT cut crystals can be manufactured both as a round disk or as a strip 
resonator, so probably they are AT. For example, these are: 
http://cfm.citizen.co.jp/english/product/pdf/HC-49_U-S.pdf and 
http://cfm.citizen.co.jp/english/product/pdf/CSA-310_309.pdf

Regards,

Javier

El 13/03/2012 21:46, ALAN MELIA escribió:
> 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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