[time-nuts] Digital Clock kit - no Integrated circuits!

[Chuck Harris]

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