[time-nuts] How to get 32.768KHz from 10MHz.
Chuck Harris
cfharris at erols.com
Thu Sep 4 16:33:28 EDT 2008
Hi Brooke,
The drive for the coils is really not very critical. All you need is
a cmos inverter and a couple of capacitors:
~1PPS--[>o---+----[>o-------|(-----+
~ | |
~ | MOTOR
~ | |
~ +--------------|(-----+
~
Yes, it is just that easy.
-Chuck Harris
Brooke Clarke wrote:
> Hi John:
>
> All the quartz clocks I've taken apart have a single coil, for example see:
> http://www.prc68.com/I/QuartzClk.shtml
>
> The drive to that coil is bi-polar and is from a single AA cell, so the driver
> IC must use an H-bridge. If you want to drive a clock like this at 1 PPS from
> a 10 MHz source you will need to use some kind of conversion circuit. That's
> why it's easier to generate the 32768 Hz signal and just drive the xtal pins on
> the clock's IC.
>
> Have Fun,
>
> Brooke Clarke
More information about the time-nuts
mailing list