I am quite aware of the fact that quartz clocks and watches drive
their movements directly from their supplies with tailored pulses.
What I said was that a 0.5 Hz square-wave from a logic source
will drive these movements if you select appropriate values of
series capacitor and resistor.
Not everyone has acquired the training to use microprocessors,
which are becoming a blight on the electronics world by being a
cheap way of making insupportable and undocumented devices
that cannot be repaired or adjusted.
The engineering that is invested in these devices does nothing
to enhance the traditional step by step evolution that was a
characteristic
of electronic technology. You cannot see a bright idea that another
has developed and take it one step further. You have a black box
and when it dies you will be none the wiser, so you will design your
own and make the same mistakes that were in the original.
cheers,
Neville Michie
On 19/05/2011, at 9:35 PM, Chuck Harris wrote:
An actual quartz analog wristwatch wouldn't do something so mundane as
to use a 50uf capacitor to drive the coils. They do this:
DRIVER-A---------------------COIL-----+
......................................|
DRIVER-B------------------------------+
And feed the drivers with these waveforms:
1.5V..........+-+.............+-+.............+-+......
..............|.|.............|.|.............|.|......
A-------------+ +-------------+ +-------------+ +---...
1.5V..+-+.............+-+.............+-+..............
......|.|.............|.|.............|.|..............
B-----+ +-------------+ +-------------+ +-----------...
Where the pulses alternately come from A and B every second.
If you use a PIC to drive the clock, the driver is easy to program
in software.
-Chuck Harris
[email protected] wrote:
I understand now why most analog wristwatches do tick every two
seconds when
the battery is low. I believed the logic used this trick to signal
low battery.
Antonio I8IOV
_______________________________________________
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.
