[time-nuts] PPS clock module

Adrian Godwin artgodwin at gmail.com
Sun Jan 27 23:05:07 UTC 2019


Or you could go the other way and count it down to a pulse-per-minute, then
drive a clock intended for a pulsynetic or similar master clock system.
They will mostly be large analog clocks but digital clocks also exist.
Still intended for display rather than a panel, but a 19" rack panel would
fit.

I'm dividing down 10MHz to 50Hz using one of TvB's dividers, then
generating a 50Hz square wave at 6V. This powers a small LED clock intended
to be run from mains power via a transformer.




On Sun, Jan 27, 2019 at 10:01 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> I don’t think anybody runs a clock off of a PPS :)  That would be nutty ….
>
> The closest I have seen is to womp up a “pulse 60 times” gizmo. Drive that
> off of the PPS. Feed the output
> into something designed for use in a bedside clock. I’d guess an 8 pin PIC
> and a few (dozen) lines of code
> is the quick way to do it. The obvious problem is that if the PPS is
> correct, the clock is not going to roll over
> on the PPS edge (unless the module accepts the 60 pulses at a very fast
> rate ….. who knows …. )
>
> Bob
>
> > On Jan 27, 2019, at 3:48 PM, John Ackermann N8UR <jra at febo.com> wrote:
> >
> > I'm putting together a portable Rb standard and thought it would be nice
> to include a clock on the panel.  I probably haven't hit the magic search
> words, but I haven't found what I'm looking: a module (no enclosure) that
> is driven by an external PPS and shows at least HH:MM:SS in 24 hour format
> on a small LED or LCD display.
> >
> > I can whip something together with an Arduino, but rather than reinvent
> the wheel I thought I'd ask if anyone knows of something that's ready to go.
> >
> > Thanks,
> > John
> >
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