[time-nuts] RE; New Wrist watch

[Bob Camp]

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-bounces at febo.com [mailto:time-nuts-bounces at 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 <lists at 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-bounces at febo.com [mailto:time-nuts-bounces at 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 <hmurray at 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.
> >
> >
> >
> >
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