wrote:
At 15 kHz, an AT quartz resonator would need to be (in size) about 200
times that,
2 cm thick (and broader than it is thick, so it'd be a Frisbee-sized
disk). They don't
make those, as far as I know. Normal mortals couldn't afford one.


This guy came close , quartz ring, not a frisbee, but close :

http://www.btinternet.com/~time.lord/QuartzRings.html

Steve Roberts


Statek used to be the original source for tuning fork style crystals,
which is what you need at low kilohertz frequencies.

http://www.statek.com/

--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email:

Please visit my GURU's LAIR web site at http://www.tinaja.com