[time-nuts] +AFs-time-nuts+AF0- Wall Clock that takes 1PPS input

[Tom Van Baak]

Michael,

Q: how much current does a AA driven quartz clock use?

See http://leapsecond.com/pages/32kHz/ for one example,

and especially http://leapsecond.com/ten/clock-powers-of-ten-tvb.pdf

where pages 75 - 78 show you the waveform, current, power. You should 
try similar measurements and report what you find. I suspect it varies 
somewhat depending on make/model.

/tvb


On 1/4/2020 3:05 PM, MLewis wrote:
> Neat trick!
>
> The AA driven quarts clocks obviously use very little current, but I 
> don't know how much.
> When using a PPS to drive such a clock directly:
> - is the current draw enough that one should isolate the PPS signal to 
> the clock so the clock/coil draw doesn't affect the PPS signal being 
> read properly from other devices?
>
> Thanks,
>
> Michael
>
> On 04/01/2020 5:46 PM, Bill Beam wrote:
>> The purpose of the series capacitor is to take the derivative of the 
>> square wave.
>> The first derivative of a positive square wave is a short positive 
>> pulse at the
>> leading edge followed by a short negative pulse at the trailing edge.
>
>
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