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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Online tech help
References: <email@example.com> <3E2D5530.34323F58@webaccess.net>
Date: Wed, 22 Jan 2003 01:52:00 GMT
NNTP-Posting-Date: Tue, 21 Jan 2003 17:52:00 PST
> Chuck Simmons wrote:
> > firstname.lastname@example.org wrote:
> >> B2431 wrote:
> >> > Every time I go look on the web for information on how something works or how
> >> > to use it I wind up going in circles. Is there a single place I can go for help
> >> > with synchro, r/d, op amp, a/d etc? I'm not looking for an EE course, just a
> >> > reference.
> >> >
> >> > Failing that is there a book I can buy without having to buy an entire library?
> >> I'd recommend "The art of electronics" by Horowitz and Hill.
> >> It has most of the above topics, with fairly in-depth info.
> >> Not synchro, which IIRC is a term for two stepper motors coupled back-back,
> >> because when one is turned (above a certain speed) the other turns at
> >> exactly the same speed.
> >> Pretty rare nowadays, as you can do quite a lot better in most cases with
> >> a chip, a rotary encoder and a stepper. (Synchros tend to lose a few steps
> >> when they start and stop.)
> > Small nit. A synchro is typically used as a rotary position sensor and
> > was sometimes used to generate error signals in carrier control systems.
> > In more recent times, they have been used as pure rotary position
> > sensors. Analog devices and other made (make?) synchro to digital
> > converters for this purpose. Another well know device for rotary and
> > linear position sensing that used principles related to those of the
> > synchro was the Inductosyn(tm). I haven't looked into position sensors
> > lately but these magnetic devices offered advantages over other types of
> > position encoders (brush and optical) in that they are more rugged and
> > capable of being used in relatively harsh environments.
> Hmm, I am now sure you are right.
> I'm blanking on the term for what I wrote though.
I found synchro, resolver and Inductosyn to digital chips and modules
with Google. These parts still have a lot of appeal for some
applications. There is a linear version of the Inductosyn that is used
on machine tools. These are accurate and repeatable and use the same
electronics as synchros and resolvers. These types of sensors are alive
and well it would seem. The animal you might have been thinking about is
the selsyn also used in AC carrier control systems.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons email@example.com
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