[time-nuts] Using speaker / earphone for PPS testing (not a question)

[Dana Whitlow]

The thing is, the shorter the electrical pulse, the less total energy is
available
(particularly in the audio frequency range), and no amount of "echoing
around"
(which is really just a form of filtering) can fix that.  So there *are*
limits.

Dana

On Tue, Apr 21, 2020 at 7:49 PM Neville Michie <namichie at gmail.com> wrote:

> I have found that a piezo sounder, a ceramic disk with two leads for
> making beepers
> works quite well for very short pulses.
> For a very short period charge flows into this device, which is a
> capacitor,
> and for that duration its dimensions are changed, and when it reverts to
> its
> original state the seismic disturbances echo around the device making a
> very clear click.
>
> cheers,
> Neville Michie
>
>
> > On 21 Apr 2020, at 12:25, Taka Kamiya via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Maybe everyone but I knew, but I just did this and found it useful.
> > 1 pps signal from some GPS are notoriously narrow and difficult to sync
> on and see on scopes.  LED will barely light if some kind of stretcher is
> not used.  If your purpose is ONLY to see if it's there or not, hook up a
> small speaker, earphone, amplified or not, and you can hear the tick-tick
> sound.
> >
> > I like DIYing and many times, I wonder if pps distribution circuit is
> working.  I can tell a very short pulse that will barely register on LED is
> clearly audible.
> > I thought I'd share.
> >
> > ---------------------------------------
> > (Mr.) Taka Kamiya
> > KB4EMF / ex JF2DKG
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>