Hi Our production test setup was not very fancy. We had a simple miniature microphone that directly contacted the module. The fixture also supplied power to the module. There was an op amp and a simple diode limiter between the mic and the input to the counter. No PLL's or crazy stuff needed. We tested several thousand modules a day with that setup...
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: Wednesday, September 12, 2012 8:51 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RE; New Wrist watch OK, I'll try but I think this is not a dark ages practice: hearing a very small vibration is related to low noise and small signal techniques. It is way easier to hear a mechanical escapement. On Wed, Sep 12, 2012 at 2:30 PM, Bob Camp <li...@rtty.us> wrote: > Hi > > Yes indeed you can "hear" the 32KHz crystal. Back in the dark ages, that's > exactly how we picked off the signal to drive a counter during adjustment > of > the watch modules. > > Bob > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Azelio Boriani > Sent: Wednesday, September 12, 2012 5:22 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] RE; New Wrist watch > > 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: > > > > > > I have a $49 Casio Wave Ceptor, white face black numerals, analog hands > > > including second hand, date, alarm and WWVB syncing in the middle of > the > > > night. Only had to replace the battery once and it ticks are closer > than > > I > > > can discern when comparing to WWV @ 10or 15 Mhz. > > > > 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? > > > > > > -- > > These are my opinions. I hate spam. > > > > > > > > > > _______________________________________________ > > 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. > > > _______________________________________________ > 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. > > > > _______________________________________________ > 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. > _______________________________________________ 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. _______________________________________________ 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.
