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

[Max Robinson]

Hal.

You may recall that the rotor had two discs which were friction linked but 
not hard linked.  One of them looked like a gear with little teeth.  The 
pole pieces also had teeth of the same pitch but they didn't touch.  When 
power was applied the smooth disc got things started running like a shaded 
pole motor.  As the rotor's teeth passed the stator's teeth the reluctance 
of the magnetic circuit was changed and the system wanted these changes to 
match the line frequency.  Once the toothed rotor locked in the smooth one 
just went along for the ride as there was no longer any current being 
induced in it.  That system was used until battery powered stepping motor 
clocks took over.

Regards.

Max.  K 4 O D S.

Email: max at maxsmusicplace.com

Transistor site http://www.funwithtransistors.net
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----- Original Message ----- 
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, January 09, 2010 4:27 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!


>
> phk at phk.freebsd.dk said:
>> That is what was known as a "synchronous clock".  Tom has one running
>> off his atoms on his web-page...
>
> When I was a kid, I took apart my share of clocks and/or clock radios.
>
> They all had the same basic mechanism.  It was a shaded pole motor with a
> semi sealed unit that included the first layer of gears.  I never took 
> apart
> one of the units.  I assume the rotor had a permanent magnet so it would 
> run
> synchronous to the line frequency.
>
> That was 50 years ago.
>
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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