Hi Tom But Bill called out a 4 pole motor. Most of what I have seen are simple single coil clocks. Wondering how his comment changes the discussion. But Bill actually didn't ask for a driver circuit just the divider ratio. Regards Paul
On Fri, Sep 11, 2020 at 6:43 PM Tom Van Baak <[email protected]> wrote: > Paul, > > I'll open the Omega Quartz Chronometer and trace the circuit if you're > curious. Many of these 70's stepper / analog clocks used Patek Philippe > movements, the classic one you see in vintage Austron, Tracor, Sulzer, > and, of course, hp time / frequency standards with the /001 clock option > (e.g., 5061A, 5065A). > > Yes, the drive circuit for the hp 5065A analog clock has a final > flip-flop on the A16 board: > > http://leapsecond.com/museum/patek/hp5065A-A16-Patek.jpg > > The 5065A manual says: "1 PPS drive pulses connect from A5 Digital > Divider through J1 to IC1 of the clock movement amplifier. > IC1 provides flip-flop action and furnishes a push-pull output to > clock amplifiers Q11 and Q12. The push-pull output of power amplifiers > Q11 and [Q?] A12 connects to the front panel clock and is limited to 10 > V peak by zener diodes CR13 and CR14." > > More eye candy: > > http://leapsecond.com/museum/patek/ > > /tvb > > > On 9/11/2020 2:50 PM, paul swed wrote: > > I went looking for the clock and found nothing. But like the rest > > discovered the divider ratio to 1Hz. But does the conversation stop at > that > > point? Since Bill said the motor was 4 pole wouldn't there be 1 more > > divider to .5 Hz with the Q and /Q essentially across the coil. Add > > protection diodes and such. > > It looks like the Omega timepieces were quite nice. > > regards > > Paul > > WB8TSL > > > > On Fri, Sep 11, 2020 at 3:59 PM Graham / KE9H <[email protected]> > wrote: > > > >> 2^22 = 4,194,304 > >> So divide by two, 22 times in a row to get to 1 Hz. > >> --- Graham > >> > >> > >> On Fri, Sep 11, 2020 at 12:42 PM Bill S <[email protected]> wrote: > >> > >>> A friend has acquired a Chelsea Clock Company Chronoquartz which was > >>> probably made in the 70's. He has measured the oscillator frequency at > >>> approximately 4.194304 MHz. He wanted to know what arrangement of > >>> dividers they used to run the 4 pole stepper motor to step seconds. > >>> Anybody know? > >>> > >>> Thanks, > >>> > >>> Bill_S > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>> and follow the instructions there. > >>> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
