Using speaker / earphone for PPS testing (not a question)
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@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@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@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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Timenuts, Gentlemen, hello!
I would like to make my little contribution to this discussion showing
how I implemented my solution in my built PRS10 Box.
For PPS and 10 MHz reference I am running since years successfully a
Trimble Thunderbold together with the antenna fixed on the rooftop of my
house (see pic).
My PRS10 together with the stretcher of the 10µs long PPS pulse to about
250ms do work like a charm already more then 12 months driving LEDs.
This way I can easy visually check the PRS10.
By the way, the PPS output of Thunderbolt, also 10µs long, can as well
be visualized with this LED driver. But I had no problem to see the
pulse on my very old 100MHz Tektronix analog scope (but this is not very
convenient for daily check :-( ).
As pictures do say more then 1000 words, I want to share the pictures of
my hardware for limited time for private timenut use, showing my way to
solve the problems with available tools and parts (beside eg. the RbO,
Thunderbold, Antenna and other used parts ;-) ).
Here you can open, view and/ or copy my pictures if you want:
https://my.hidrive.com/share/wyaryf.3uq
Comments?
Enjoy!
kind regards,
Arnold, DK2WT
Am 21.04.2020 um 04:25 schrieb Taka Kamiya via time-nuts:
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@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
An aside,
How about sending two identical PPS pulse to the left and right channels of a pair of stereo headphones. I estimate that time interval errors of under 100us should be detectable, and would appear as the pulse "moving" across the sound stage. Could be an interesting way of getting an indication of TIE. It could also allow you determine that two pulses are roughly aligned without reaching for the scope.
The PPS may appear a single point sound directly ahead of the listener, moving left or right according to the delay. Ultimately as delay increases two distinct pulse would be heard. I'm not sure where that point would be. Probably several milliseconds.
If anyone has the time to try it, I'm sure the group would be interested in the results.
Best Regards,
Tony Flavin
-----Original Message-----
From: time-nuts time-nuts-bounces@lists.febo.com On Behalf Of Arnold Tibus
Sent: 22 April 2020 22:56
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] Using speaker / earphone for PPS testing (not a question)
Timenuts, Gentlemen, hello!
I would like to make my little contribution to this discussion showing how I implemented my solution in my built PRS10 Box.
For PPS and 10 MHz reference I am running since years successfully a Trimble Thunderbold together with the antenna fixed on the rooftop of my house (see pic).
My PRS10 together with the stretcher of the 10µs long PPS pulse to about 250ms do work like a charm already more then 12 months driving LEDs.
This way I can easy visually check the PRS10.
By the way, the PPS output of Thunderbolt, also 10µs long, can as well be visualized with this LED driver. But I had no problem to see the pulse on my very old 100MHz Tektronix analog scope (but this is not very convenient for daily check :-( ).
As pictures do say more then 1000 words, I want to share the pictures of my hardware for limited time for private timenut use, showing my way to solve the problems with available tools and parts (beside eg. the RbO, Thunderbold, Antenna and other used parts ;-) ).
Here you can open, view and/ or copy my pictures if you want:
https://my.hidrive.com/share/wyaryf.3uq
Comments?
Enjoy!
kind regards,
Arnold, DK2WT
Am 21.04.2020 um 04:25 schrieb Taka Kamiya via time-nuts:
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@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@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.