Jerry you are right. See what it does on the original oscillator and match
it. With respect to advancing you can't go to crazy as the unit will
stutter. I want today I can advance the clocks I have at about 15 sec for 1
minute. Maybe faster.
Anarduino will be very fine for what you are doing.
On
I recall using a clock like that. I drove the coil with a 5v cmos type D
flipflop. The coil is hooked to q and ~q with a couple of resistors.
That way you get the reversal of voltage with little fuss.
Don
On 2020-01-02 16:32, Jerry Hancock wrote:
I’ll have to go read about the Lord Vetinari
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I’ll have to go read about the Lord Vetinari clock. He is one of my favorite
book characters.
Thanks for all the tips. I might have an old quartz clock around here to test.
I assume I can just measure the pulse while it is running and generate the
same with the 1PPS output. I’ll have to
I have also solved the same problem I have 4 Seth Thomas quartz clocks with
the red 24 numbers in the display driven by a single driver with
independent advance and hold for each clock. (Needed for multiple time
zones)
Generally reasonably quite. As mentioned they must be driven at a
alternating
Jerry,
The Chinese NTP server that I've been discussing here lately has outputs
for 1PPS, 1PPM and 1PPH.
The plain vanilla NTP server (no 10MHz.) goes for 150-200.
George, N2FGX
On 1/2/2020 13:21, Jerry Hancock wrote:
Hello,
I looked around but can’t find a wall clock that would take a
It depends on how much work you want to do. I have various clocks driven
off 1PPS (or 2PPS) signals. The cheapest approach is to take almost any
quartz clock with a second hand and drive the coil directly (you need to
pulse with alternate polarities -- i.e. there are even and odd pulses).
I was
Services for our fallen fellow time nut Bob Roehrig are this Saturday January
4, in Batavia, IL. Bob was a member of this list, and many of you may remember
him from articles and projects published in 73 Magazine (and others) such as
1994's "Using the World's Most Accurate Frequency Standard"
I don't know of one available commercially, but it would not be hard to modify
a standard quartz clock to do this. The standard quartz mechanism uses a motor
that advances the seconds hand one second each time a pulse is applied to it.
The catch is that every other pulse has to be the opposite
Hello,
I looked around but can’t find a wall clock that would take a 1PPS input signal
to drive the minutes and seconds. I’ve made digital modules using a lot of
different displays but would love to have a large, 14” or so with a second
hand, wall clock that I can drive with 1PPS. The old
Hi,
Many thanks for those references. Downloaded and stored for future
reference and reading.
Check out US4358741 and US4417352.
Cheers,
Magnus
On 2020-01-02 18:10, Anders Wallin wrote:
> fwiw, looks like the spectradynamics patent expired today:
>
fwiw, looks like the spectradynamics patent expired today:
https://patents.google.com/patent/US6278330B1/en
afaik that design (more or less) is also described in
https://doi.org/10.1109/FREQ.1998.717932
a variation is also https://doi.org/10.1109/EFTF.2012.6502322 (which might
be sold by
Hi Dan,
I would use a pair of dividers to get them to the common frequency of 5
MHz, so divide by 2 and 25, then use a SR flip-flop and then feed it to
an op-amp doing a PI-loop. Be sure to make it well damped, so a damping
factor of 3 or more. The bandwidth of the loop should be relatively
high.
Hi
A low phase noise VCXO is going to be up in the vicinity of $20. An MCU that
will do the
loading stuff is in the << $1 range. BOM wise, the MCU is round off error. Code
wise, the
firmware is “high school project” level stuff.
Bob
> On Jan 2, 2020, at 9:26 AM, Dan Kemppainen wrote:
>
>
Hi All,
Just to clarify, the PLL we're looking for only needs to do the 10 ->
125MHz. The 125 ->MHz 3.125GHz is in a separate device with it's own
PLL. I have some, but not a lot of control over that. The goal here is
to provide a good source for the 125Mhz, for not a lot of board space
and
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