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 <[email protected]> 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 < > [email protected]> 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 -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
