[time-nuts] Re: Crazy Clock

[Bill Beam]

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