[time-nuts] Digital Clock kit - no Integrated circuits!
Chuck Harris
cfharris at erols.com
Sat Jan 9 23:09:51 UTC 2010
Sing is an understatement!
The motor is essentially a stepper motor that is being run with
a 2 phase excitation. It is driven with 1000Hz, and whines pretty
good... Fortunately it is in a thick aluminum case that is both air
and water tight.
It is considerably quieter if you make sure the ball bearings
are in good shape.
-Chuck Harris
J. Forster wrote:
> HP made one with a sync motor running a Veeder Root counter. Something
> like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit.
> It does "sing" a bit.
>
> -John
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