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

[Max Robinson]

The GR system did the same thing.  There's wasn't sound proofed and really 
made a whine.  I had a NASA surplus one running in my office for about a 
week when someone in the department needed a stable 1ms time reference.  It 
didn't take me long to build one with 7490s.

Regards.

Max.  K 4 O D S.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Chuck Harris" <cfharris at erols.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, January 09, 2010 5:09 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!


> 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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