[time-nuts] Digital Clock kit - no Integrated circuits!
djl at montana.com
Sun Jan 10 00:29:07 UTC 2010
Hp kinda stole the idea from the old General Radio syncro clock (I have
two of these). In the longago time, we had a homemade version that
generated 1 sec ticks to drive clocks in our research tower lab at New
Mexico Tech. It ran for a number of years.
> 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.
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Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
Huson, MT, 59846
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