[time-nuts] Chelsea Chronoquartz dividers

[Bob kb8tq]

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 <k8yumdoober at gmail.com> 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 <ke9h.graham at gmail.com> 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 <wls at jbpet.com> 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
>>> 
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