Hi, Brooke,
My self winding clock synchronizes fine on three volts. I built a
synchronizer using a PIC controller with a 32KHz quartz crystal, running
on three volts. You might want to carefully check the coil and
connections on yours. By the way, the winding coils also are running on
three volts.
Don Couch
On 10/14/2015 11:02 AM, Brooke Clarke wrote:
Hi Nick:
One of my Self Winding Clock Co. (WU) clocks was taken down yesterday
for painting.
When put up one of the Ken's Clock Synchronizers was installed and the
hands moved to align with the heart shaped cam it uses, but it never
worked.
The problem was it used a 4.5 Volt signal which can develop the
current needed to pull the sync electromagnet the time constant is far
too slow.
I'm going to add a high voltage circuit with series resistor to get
the time constant down one or two orders of magnitude. The key to
this is a PCB I make that holds 5 each 9V batteries connected in
series, so I'll use one, two or more of them to get the time constant
down.
http://www.prc68.com/P/45VS.html
Before I had the 45 Volt Stick I was considering getting the needed
high voltage by charging a cap a minute or two before the top of the
hour and discharging it through a resistor. Here's a video showing
that would work.
http://www.prc68.com/I/SWCC.shtml#Experiments_Feb_2014_
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Nick Sayer via time-nuts wrote:
On Oct 14, 2015, at 4:42 AM, billriches <[email protected]>
wrote:
Not milisecond time distribution but time related!
In the early half of the 1900s Western Union was in the time
business. They
would rent businesses such as banks, office buildings, etc clocks
for a few
dollars a month. These were pendulum wall clocks that had 2 #6 dry
cell
batteries inside that would wind them every hour or so. The clocks were
connected to the WU telegraph line and for a minute before and
after the
top of the hour all traffic on the circuit would stop. Exactly at
the top
of the hour they would push a pulse of 50 ? volts or so over the
line and it
would reset the clock to the top of the hour.
The WU standard time service goes back further than the turn of the
20th century. It started in 1870.
I’ve always wanted to get my hands on one of those clocks and come up
with a circuit to recreate the synchronization signal for it,
probably with a Raspberry Pi running ntpd and a big ol’ MOSFET. The
problem is that at this point, those clocks are quite expensive once
they’re reconditioned.
My understanding (perhaps incorrect) was that the sync pulse was once
daily and, as you said, would cause the hands to “snap” to 12. The
trailing edge of the pulse was synchronized and would release the
clock to operate normally.
That they had something as accurate and widespread as it was so early
is astonishing.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
