Analog quartz clocks may be used as slave clocks.
You do not even have to disconnect the quartz movement.
Just find the coil on the motor and drive it with a square-wave of
0.5 hertz,
in series with a capacitor (about 50mfd) and a resistor (about 200 ohms)
Each type of clock is different, though they all are driven by
something like 1.5 V
20ms alternate polarity pulses.
The actual values are not critical but must be determined for each
type of clock.
If the capacitor resistor combination is wrong it will not work. Too
much signal
will make motors "pole" and refuse to rotate. The capacitor charges
when the
polarity changes and that current operates the clock. The resistor
sets the length
of the pulse together with the capacitor value, as well as setting
the maximum current.
Just swap values until the action is quiet, definite and reliable.
I have used this method on at least 4 different types of quartz
clock, usually from a 5 volt
logic signal.
Cheers,
Neville Michie
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