[time-nuts] Odd request

[jmfranke]

As I type this, my solenoid actuated mechanical slave clock is being driven 
by my GPS receiver.  The 1PPS signal drives a two stage divide-by-sixty 
counter.  The two counter stages, 7490 divide by ten and 7492 divide by 
twelve used as a divide by six, are interfaced to two large Nixie tubes to 
display seconds and tens of seconds respectively.  I use a 7420 four input 
NAND gate to detect "59" which is output to the slave clock driver.  The 
slave clock advances when the drive solenoid releases, hence it increments 
at the end of the 59th second.  The output from the divider section drives 
the mechanical slave clock which displays minutes and hours.  I hope to 
finish breadboarding the control panel tomorrow and then start boxing up the 
unit.  Now, I am just comparing the sound of the once per minute, 1PPM?, 
click of the slave clock movement to the voice announcements from CHU. 
Sure, it is a strange clock, but I like the mixture of mechanical, Nixie, 
and GPS.

John  WA4WDL


----- Original Message ----- 
From: "jmfranke" <jmfranke at cox.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Thursday, January 25, 2007 5:57 PM
Subject: Re: [time-nuts] Odd request


>I am going the same route and have discovered slave clocks which are
> solenoid driven clocks.  The clocks were once very popular in schools and
> factories. The hands typically step in one minute steps.
>
> See: http://www.clockhistory.com/setclocks/index.html
>
> I plan to use one of the clock movements to display minutes and hours and 
> a
> two digit LED digital display for the seconds.  I will divide the 1PPS
> output from a Z3801A by 60 to get 1PPM.
>
> John  WA4WDL
>
> ----- Original Message ----- 
> From: "Mark Amos" <mark.amos at toast.net>
> To: <time-nuts at febo.com>
> Sent: Thursday, January 25, 2007 4:50 PM
> Subject: [time-nuts] Odd request
>
>
>> Time-nuts
>>
>> I appreciate the comments regarding horological obsession.  Mine started
>> with a desire for an accurate master
>> oscillator for my ham shack (built and use a couple Shera GPSDO's) and 
>> has
>> blossomed into a much broader interest
>> in time (Ex tempus, sapientia?)
>>
>> This has led me to a silly quest.  I'd like to use a traditional clock
>> face and hands as an output device for a
>> 1PPS signal from my GPSDO.
>>
>> I know this is a very broad question, but does anyone have advice on 
>> where
>> I might start hacking (or making) a
>> mechanical clock face to accomplish this? Is there a simple clock design
>> that I could start with to build my own?
>> Maybe replacing a pendulum or escapement with a solenoid?  Any examples 
>> to
>> work from?
>>
>> Mark
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