[time-nuts] Odd request
Tom Van Baak
tvb at LeapSecond.com
Sun Apr 22 00:55:35 UTC 2007
> 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
That mechanical mixture is music to my ears. Nicely done.
One question - what happened to your clock after the most
recent leap second, 12/31/2005 ;-)
/tvb
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