Re: Drive corrector plans
PFAFF2@delphi.com
Fri, 17 Mar 1995 00:19:50 -0500 (EST)
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> From: fmicos!argus!dillinge@uunet.uu.net (Stephen Dillinger)
> Subject: Re: Drive corrector plans
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> > A friend in my astronomy club is trying to get some plans for a dual-axis
> > drive corrector.
>
> I would suggest trolling through back issues of S&T for articles about
>them. I
> can distinctly remember 3 over the past 15 years. I made a stepper motor
> controller/corrector and have had very good luck with it. One thing I would
> definitely advise is to use a crystal for the reference clock instead of an RC
> oscillator. I have the RC circuit and according to the data sheet it's fairly
> stable over a normal temperature range but I still notice drift. The benefit
> is you don't have to divide down an RC oscillator if you chose the R&C
> correctly.
>
> The drive corrector plans I remember that deal with AC motors are from
>the late
> '70s or early '80s. They really aren't very complex to build...
>
> Steve Dillinger
> fmicos!dillinger@uunet.uu.net
>
>
Look up Sky and Tel Aug 1975. I built this variable frequency crystal
drive corrector in 1975 and still use it today. Great unit rock solid.
Bob Pfaff