Didn't the clocks in cars back in the day use the same sort of thing to wind themselves? Though I remember a single click every x minutes, not the vibration of a solenoid.
Bob From: Brooke Clarke <bro...@pacific.net> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, November 1, 2014 4:14 PM Subject: Re: [time-nuts] 1903 Railroad self-Winding / Self-setting Clock Hi Hal: The click-click-click... is the self winding. A solenoid vibrates back and forth and a pawl and ratchet winds the main spring. https://www.youtube.com/watch?v=QIxOVo_0xgo&feature=youtu.be Mail_Attachment -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html Hal Murray wrote: > We had something like that in school when I was a kid. (many years ago) > > I remember occasional click-click-click... as it got reset. > > > mp...@clanbaker.org said: >> I am wondering what the easiest approach to this might be? I suppose I >> could take the 1-sec pulses from a GPSDO (Trimble Thunderbolt ?) and count >> 3600 of them to generate a momentary reset 3VDC signal. In any event, I >> thought I would pass this by the Time-Nuts gang to see if any feedback is >> available as to what the least complicated (simplest) way might be to >> accomplish this. > Counting to 3600 won't work with leap seconds. :) > > I don't know the details of how a pulse sets the clock hands. I assume it > can't set the time to a fraction of a pendulum swing so I don't see much use > for something fancy like a GPSDO. But this is time-nuts, so anything is > possible. > > I'd probably split the project into two parts. One is to keep good time on a > computer, say something like a Raspberry Pi. You can use the net, or a low > cost GPS unit, or something fancy like a GPSDO. > > The second part is how and when to generate the pulse. You can use GPIO > pins, or modem control signals. > > You could use an old PC, but the payback due to reduced power will pay for a > Raspberry Pi in a year or two depending on your power rates and how much > power your old PC burns. > > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.