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: [email protected] [mailto:[email protected]] 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 <[email protected]> wrote: > From: Magnus Danielson <[email protected]> > Subject: Re: [time-nuts] quartz crystal configuration in small cases > To: [email protected] > 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
