[time-nuts] 50/60 Hz clocks
Robert LaJeunesse
rlajeunesse at sbcglobal.net
Thu Mar 10 22:41:22 UTC 2011
Poor man's solution: Use an Arduino to read the Thunderbolt 1PPS and lock a 50Hz
(or 60Hz) square wave to the 1PPS. Any resulting jitter can likely be kept in
the tens of microsecond range, easily filtered out by the clock mechanics.
Filter the square wave a bit and feed it into an audio amplifier (or two) of
sufficient power to run the clock. (Possibly a 12V powered bridge amplifier at
~14W would be adequate?) Use some sort of audio output or filament transformer
backwards to create the proper line voltage to run the clock. Maybe run the
whole thing off a 12V battery with float charger for uninterruptible timing.
good luck
Bob L.
________________________________
From: Cezary Rozluski <cpr at igf.edu.pl>
To: time-nuts at febo.com
Sent: Thu, March 10, 2011 4:54:37 PM
Subject: [time-nuts] 50/60 Hz clocks
...
Let us suppose I have Thunderbolt (I really have one) as a time/frequency
source, but any other time-nuts recognized frequency source should by sufficient
for the fun to drive old 50/60Hz stuff with the highest precision available (and
for fun, comparable to www.leapsecond.com solution, modulo cesium/hydrogen
clock). It would be very nice to see correction for leap seconds as well :-)
:-)
Regards,
Cezary
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