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

[Bob kb8tq]

Hi

A lot also depends on what sort of voltage / power the speaker is expecting. 
If it’s a high impedance voice coil gizmo things aren’t going to be as easy as
with a piezo gizmo designed to work in a 1.3V battery powered greeting card. 

Where did I leave that 10KV output amplifier ….. should be easy to find …. :)

Bob

> On Apr 22, 2020, at 5:59 AM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
> 
> 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
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>> 
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