If I recall correctly it was in RF Design magazine many years ago that a short article included a schematic for using an ultrasonic sensor and selective amplifier (narrowband PLL?) to pick up the 32KHz vibration and convert it to a measurable signal. I'd expect a normal microphone to pick up way too much extraneous noise such that the 32KHz could not be successfully recovered. Bob L.
________________________________ From: Azelio Boriani azelio.bori...@screen.it Interesting: trying to "hear" a low frequency crystal using a microphone... it should be hard: the crystal has to make the case vibrate and this is energy consuming (unless it resonates). I don't expect to pick up nothing, except the step motor driving the hands. On Wed, Sep 12, 2012 at 9:45 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > Has anybody "listened" to such a watch? (with a microphone) > > Can you hear both the 32KHz basic timekeeping as well as the "tick" when > the > second hand takes a step? _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
