Hi Most likely the lowest parts count is to divide to a narrow(ish) 20 Hz square wave and then drive a resonated transformer with a pulse. The output won't look pretty, but it should drive a small clock motor just fine. Done properly, there should be very little power involved.
If you are going to use anything complicated, just run a gizmo that lets you have a PLL at a factor of 3 times the input. Once that's done - problem solved. Bob On Mar 19, 2011, at 3:01 PM, Michael Poulos wrote: > Robert LaJeunesse wrote: >> 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. > When using the power transformer "backwards" keep in mind the impedance > output of the amplifier. Audio amplifiers are rated in watts into an 8 ohm > (or 4 ohm) load. So, what you want is a power transformer of desired wattage > and the low voltage side having a volt and amps rating that would match an 8 > ohm load or 4 ohm load. Then, you hook it "backwards" (i.e. as a step-up > transformer) to an audio amp of a rating higher than the transformer then > hook the signal to the input and use the volume knob as a throttle. Turn up > until desired voltage is reached. > > Have fun! > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
