The oscillator you linked to has a fixed frequency output. You might
prefer to get a vcxo that has a DC control voltage input that will
slightly change the output frequency so it can be adjusted to be
closer to "exact." This appears to be the least expensive one with a
10MHz output:
I've seen discussion of making a seismic vault (though not sure if
they used that name, making it harder to find in the haystack of
posts) on this mailing list, maybt 15 or 20 years ago, so nut sure if
this is helpful:
https://www.seismicnet.com/maillist.html
For possible immunity from
This might be desirable.
https://www.ebay.com/itm/THE-AMATEUR-SCIENTIST-ON-CD-ROM-LATEST-EDITION-VERSION-4-M2071-/112117678275
On Wed, Mar 3, 2021 at 4:19 PM Chris Caudle <6807.ch...@pop.powweb.com> wrote:
>
> > On Tue, 02 Mar 2021 22:42:45 -0800
> > Hal Murray wrote:
> >
> >> The basic idea is
On Fri, Oct 23, 2020 at 9:14 AM jimlux wrote:
> ...
> to be set - for instance, Arduinos work that way:
>
> digitalWrite(pin#, HIGH)
>
> I think GPIB would still work if you had to do 8 digitalWrite() calls,
> then a final digitalWrite() call to assert DAV.
>
>
> I suspect that for a number of
On Fri, Oct 23, 2020 at 10:55 PM Wes wrote:
> Not exactly the same book but the same author:
>
> "Introduction to quartz crystal unit design" There seems to be a copy in the
> UK
I see several copies of this in the $20 range on bookfinder.com,
click "view all matches combined" at the link
I saw this the other day but not sure if this was answered:
> I read the document "Enhanced WWVB Broadcast Format" by John Lowe from
> NIST. One thing that is confusing to me is this paragraph: "Although the
> phase representing the information in each symbol is shown to be
> available before the
Adafruit and Sparkfun sell a remarkable number of SMT parts already on
breakout boards for moderate prices. I looked up the three parts and
found the DS3231 on a board (two different boards even), in stock and
ready to order from Adafruit (most Adafruit and Sparkfun products are
also sold through
Despite my interest in the precision high-end of electronic design
(and thus being a subscriber to this list), I have very little
experience with such high-fallutin' designs. Still, I've done and seen
some "interesting" things in my career. It's amazing how the minutiae
of even jelly bean
> > On Feb 1, 2020, at 9:58 PM, Ben Bradley wrote:
> >
> > I'm wondering about the balance wheel, if it's ferromagnetic (has iron
> > or steel in it, which would probably make this idea not work), or if
> > it's perhaps all aluminum or similar non-magnetic material. A
I'm wondering about the balance wheel, if it's ferromagnetic (has iron
or steel in it, which would probably make this idea not work), or if
it's perhaps all aluminum or similar non-magnetic material. Adding a
constant magnetic field from a coil and electric current source would
provide a magnetic
You may be interested in a thread here earlier this year titled
"Absolute time accuracy pre-Cesium?" starting March 25. Also, look for
references to John Harrison in the archives. There's a video showing
several of his clocks running with the grasshopper escapement, and one
of his long clocks
://www.electronicdesign.com/files/29/6131/figure_02.gif
https://web.archive.org/web/20121113202731/https://www.electronicdesign.com/files/29/6131/figure_03.gif
On Wed, Jul 10, 2019 at 1:06 AM Ben Bradley wrote:
>
> I recall Bob Pease in one of his many "What's all this ...stuff"
> columns made a
I recall Bob Pease in one of his many "What's all this ...stuff"
columns made a small oven and PID temperature controller that he
claimed kept the temperature within 0.001 degrees or something like
that. This would make machine learning severe overkill. Temp control
is slow enough (and
I just read this on Gizmodo, it surely adds no technical info for this
crowd, but I'm impressed with both how much info it does have, as well
as its correctness for a layman-oriented article:
https://gizmodo.com/why-is-nasa-sending-an-atomic-clock-into-space-1835282558
On Thu, Jun 6, 2019 at 8:00
This thread reminds me of a few things, firstly, nuclear fusion:
On Wed, Jun 5, 2019 at 1:00 AM jimlux wrote:
>
> 30 odd years ago, I heard a speech from a guy at AT who said that by
> definition, you cannot predict technology that will result in a
> revolution ahead of time.
>The cost of a
For independent standards (not quite what you asked) I recall from
"The Science of Clocks and Watches" (a book with much technical info
if you're interested in these mechanical devices) that the most
accurate mechanical/pendulum clock was the Shortt Clock that used a
pendulum in a vacuum chamber
I have a comment regarding "classic equipment." About 20 years ago I
got an HP 410B VTVM, was pleasantly surprised that it still appeared
to be within the stated accuracy, but was astounded to find the
short-circuit current (measured the current range on a modern DMM) on
the 1-ohm scale was 100mA.
I have a bit of a "crude but effective" idea regarding getting
Daylight Savings and local time and such - get the current time (hour)
from local cellular signals with a cellular phone module, like one of
these:
https://www.adafruit.com/category/281
If I understand correctly, you don't need
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