[time-nuts] synch for pendulum clock....

Tom Curlee tcurlee at sbcglobal.net
Sun Dec 11 17:12:11 EST 2011

Check the Scientific American Amateur Scientist index for clocks here:  http://amasci.com/amateur/sciamdx.html#52-CC  It looks like the September 1974 issue has the article on using discrete cmos logic to synchronize a pendulum clock to a quartz crystal.


--- On Sun, 12/11/11, Brian, WA1ZMS <wa1zms at att.net> wrote:

From: Brian, WA1ZMS <wa1zms at att.net>
Subject: [time-nuts] synch for pendulum clock....
To: "Time Nuts" <time-nuts at febo.com>
Date: Sunday, December 11, 2011, 1:32 PM

This was talked about several years ago, but did anyone get a fully functional design running using electromagnets to synch at one or both ends of the travel?

In the meantime I am using a sensor to measure the time period of the pendulum for this particular new grandmother wall clock and from that, I can synthesize a pulse train from one of the 10MHz lab clocks to drive the electromagnets to cause a subtle synch at the end(s) of the pendulum travel. The pulse train freq is custom for a given clock.

Anyway...... that's my scheme for now.
Feedback welcome.

-Brian, WA1ZMS
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