Hi If it was a custom chip, then the motor driver “stuff” would be integrated into the IC. That was indeed the case back in the 1970’s when I was designing this sort of thing. Those chips were pretty hard to dig up, even back then. Unless you wanted to buy >10K pcs a month, they really didn’t want to talk to you …. In our case that was true even though a sister division made the chips !!!
======= Four pole stepper pulse sequences are pretty well defined. https://www.youtube.com/watch?v=kNyAcAHLET8&app=desktop <https://www.youtube.com/watch?v=kNyAcAHLET8&app=desktop> (just the first hit on a search, there are *lots* of other references ….) Indeed there is some variation depending on just how the coils are wound. The basic pulse sequence is still the same. Bob > On Sep 11, 2020, at 4:53 PM, Dana Whitlow <[email protected]> wrote: > > It may be that he's looking for info on how to drive the stepper motor(s), > such as > pulse sequences etc. > > Dana > > > On Fri, Sep 11, 2020 at 2:59 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.
