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

[Neville Michie]

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
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