[time-nuts] Wall Clock that takes 1PPS input

[djl]

I recall using a clock like that. I drove the coil with a 5v cmos type D 
flipflop. The coil is hooked to q and ~q with a couple of resistors.
That way you get the reversal of voltage with little fuss.
Don

On 2020-01-02 16:32, Jerry Hancock wrote:
> I’ll have to go read about the Lord Vetinari clock.  He is one of my
> favorite book characters.
> 
> Thanks for all the tips.  I might have an old quartz clock around here
> to test.  I assume I can just measure the pulse while it is running
> and generate the same with the 1PPS output.  I’ll have to program a
> way to advance it, maybe use an Arduino or some other micro and add a
> few switches.
> 
> 
> 
>> On Jan 2, 2020, at 12:43 PM, Philip Gladstone 
>> <pjsg-timenuts at nospam.gladstonefamily.net> wrote:
>> 
>> It depends on how much work you want to do. I have various clocks 
>> driven
>> off 1PPS (or 2PPS) signals. The cheapest approach is to take almost 
>> any
>> quartz clock with a second hand and drive the coil directly (you need 
>> to
>> pulse with alternate polarities -- i.e. there are even and odd 
>> pulses).
>> 
>> I was introduced to this technique by building a Lord Vetinari clock 
>> (e.g.
>> https://www.instructables.com/id/Lord-Vetinari-Clock/ )
>> 
>> I purchased something like
>> https://www.ebay.com/itm/8-5-INCH-KAPPA-SHIPS-BOAT-YACHT-MARINE-RADIO-ROOM-SLAVE-NAVIGATION-CLOCK/143072681993?hash=item214fcbe009:g:Gn8AAOSwYTtcKPIp
>> and
>> it turned out to be a 2PPS clock....
>> 
>> Fun getting this stuff working!
>> 
>> On Thu, Jan 2, 2020 at 3:32 PM Jerry Hancock <jerry at hanler.com> wrote:
>> 
>>> Hello,
>>> 
>>> I looked around but can’t find a wall clock that would take a 1PPS 
>>> input
>>> signal to drive the minutes and seconds.  I’ve made digital modules 
>>> using a
>>> lot of different displays but would love to have a large, 14” or so 
>>> with a
>>> second hand, wall clock that I can drive with 1PPS.  The old IBM 
>>> clocks,
>>> etc I found take a pulse on the minute.  I have an old pendulum clock 
>>> I can
>>> drive with a solenoid but thought I would ask here before going that 
>>> route.
>>> 
>>> Signal levels aren’t important.
>>> 
>>> Thanks
>>> 
>>> Jerry
>>> 
>>> 
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> 
> Jerry Hancock
> jerry at hanler.com
> 
> 
> 
> 
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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304