[time-nuts] Re: Crazy Clock

[Adrian Godwin]

Does it need to be a mechanical clock or would a computer display do ?
I think Lady Heather will display GPS time rather than UTC. So a raspberry
pi board (even the very oldest spec, not one of the hard-to-find ones)
would be adequate.
I realise that's different to what you asked for, but it seems as though it
gives you what you want.


On Thu, Dec 15, 2022 at 3:25 PM David G. McGaw via time-nuts <
time-nuts at lists.febo.com> wrote:

> 1PPS into a toggle flip-flop such as a 74AC74 w/ feedback (AC has strong
> output drive, can run off 2V to 5.5V) followed by a differentiator
> (could be just an appropriate capacitor) could generate the bipolar
> pulses for a standard battery clock movement.
>
> David N1HAC
>
> On 12/15/22 2:59 AM, Bill Beam via time-nuts wrote:
> > Relatively easy DIY project.  Most battery operated wall clock movements
> are driven
> > by a two phase motor - positive pulse followed by negative pulse.  Many
> GPS modules
> > provide a single phase pps output.  The problem is to generate the bi
> phase from the
> > single phase pps.  I have a Brooks Shere system running that has a
> 'heart beat' signal
> > available (one second on, one second off).  If that signal is applied
> thru a series capacitor
> > (about 47-100 microF) it will be differentiated to provide the bi phase
> pulses.
> > Remove the battery from the clock.  Locate the motor winding and apply
> the bi phase signal.
> > I have had a couple of wall clocks driven by GPS for years.  It only
> missis a beat if the GPS goes down.
> >
> > Alternate solution is to use a micro processor on a chip (about $2.50)
> to generate bi phase
> > from pps.  That takes about 4-6 lines of program, depending on the chip.
> >
> > Regards.
> > Bill, NL7F
> >
> > On Tue, 13 Dec 2022 15:09:26 -0500, Bob Camp via time-nuts wrote:
> >
> >> Hi
> >> I realize that this is a bit of an odd project, but this is Time Nuts
> G??..
> >> I want a analog wall clock that reads out GPS time. As far as I can
> tell, nobody
> >> is crazy enough to make one and sell it in the open market. If indeed
> there is
> >> one out there, that would be great. This does not have to be a project.
> >> If it is a project, IG??m lazy, I donG??t want to set the thing and
> then count on it never
> >> missing a beat. I want a movement that has some form of feedback. The
> >> WWVB clocks have a movement like this. I could tear one apart and try to
> >> reverse engineer the guts. That sounds like. a project inside a project.
> >> Does anybody sell feedback movements like this in the hobby market? If
> so has
> >> anybody used one and can vouch for it working for more than a few
> months?
> >> Indeed, doing it with a display of some sort would be easier in some
> respects.
> >> For now at least, IG??m looking for a mechanical gizmo with hands that
> move.
> >> If it reads out 12 hour time thatG??s ok. 24 hour time would be super
> cool, but
> >> itG??s not vital.
> >> Anybody know of a source?
> >> Thanks!
> >> Bob
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> >
> > Bill Beam
> > NL7F
> >
> >
> >
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