This not a plug for a product; Spectrum is out of business as of 7/4/2019 and
allows free downloads of their
various product releases that may be of interest to some on the list.
>From their brochure: Micro-Cap 12 is an integrated schematic editor and mixed
>analog / digital simulator that
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
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
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 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
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
Sorry OM. I just created a one off.
If I get another 4-5 people, I'll make a small batch of boards.
George
On 9/11/2020 10:42, Lester Veenstra via time-nuts wrote:
Boards?
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
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 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
Isn't the 4 MHz crystal near the sweet spot for one of the cuts? A dim
memory at best :-)
DJ
On 2020-09-11 11:57, Tom Van Baak wrote:
Bill,
4194304 Hz = 2^22 Hz so 22 flip-flops gets you down to 1 Hz. The
binary divider is s similar to how the Seiko Beta 21 was designed. See
[1] for an
That was the same frequency Chrysler used in their early (70s) quartz car
"chronometers". The 1981 Chrysler Imperial electronic dashboard used that
frequency as well.
Bob L.
> Sent: Friday, September 11, 2020 at 1:30 PM
> From: "Bill S"
> To: "time-nuts@lists.febo.com"
> Subject: [time-nuts]
HINT: 2^22 = 4194304
On 2020-09-11 11:30, Bill S 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
Bill,
4194304 Hz = 2^22 Hz so 22 flip-flops gets you down to 1 Hz. The binary
divider is s similar to how the Seiko Beta 21 was designed. See [1] for
an example of a clock that uses this frequency.
What's nice about the Omega Ships Chronometer shown there is that it has
a LEMO 1PPS output
Hi
Well …. 4.19304 = 2^22
I’d bet they used a bunch of divide by 2 ( or 2^N ) parts. :)
At some point they went from electronic division to driving gears. Is that what
he’s looking for?
or is he after the brand / model of divider chip? It’s quite possible that they
used a custom part,
even
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?
Boards?
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell
On Freitag, 11. September 2020 01:08:09 CEST Kevin Schuchmann wrote:
> Guess my image didn't make it, I will add it as an attachment this time.
The temperature curve seems to show some correlation to what is happening with
the DAC. Seems that the DAC and OSC jumps are mostly during periods of
Thanks to Bruce and George.
The NIST doubler is indeed what I planned to use, or a Minicircuits AK-2.
What voltage do you guys measure on the oven monitor output? I am not sure
whether this is really 10mV/K. Mine outputs some 4 volts, that would mean
oven is >100°C which I don't believe.
BR
16 matches
Mail list logo
