Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor

I suppose the M393 could be an LM393 dual comparator, which might be useful
in cleaning up the output from the optical sensors. If that is the case the
LM393 pinout should make it much easier to deduce the rest of the circuit.
It may be as simple as a couple of LEDs and a couple of sensors.

http://www.national.com/pf/LM/LM393.html
--
Phil Mattison
http://www.ohmikron.com/

----- Original Message -----
From: James Washer <washer@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, November 28, 2006 1:45 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor


> Thanks... that first link is nice.. I just wish I could find the docs for
that chip... google-ing didn't find anything.. I should be able to determine
power and ground by looking at the circuit board, etc.. but as to the
signal... it may be harder to figure out... could be drivers, could be OC,
etc. oh well, if I burn this one up, I can buy something else.
>
> - jim
>
> On Tue, 28 Nov 2006 12:50:33 EST
> cnc002@... wrote:
>
> >
> > In a message dated 11/28/2006 12:16:48 P.M. Eastern Standard Time,
> > mattison20@... writes:
> >
> > The gizmo is probably a quadrature encoder. See:
> >
> > http://www.sxlist.com/techref/io/sensor/pos/enc/quadrature.htm
> >
> > http://en.wikipedia.org/wiki/Rotary_encoder
> >
> > To figure the pinout you first need an idea how it works.
> > --
> > Phil Mattison
> > http://www.ohmikron.com/
> >
> > ----- Original Message -----
> > From: James Washer <washer@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Monday, November 27, 2006 10:56 PM
> > Subject: [CAD_CAM_EDM_DRO] Help understanding servo motor
> >
> >
> > > I have a couple of small servo motor pulls from a big plotter. On one
end
> > of the motor is a "gizmo" that has a few electronic components (mostly
> > resisters, an LED, and clear plastic disk attached to the motor shaft,
a
> > couple of pots, and an 8pin chip marked with the Mitsubishi logo and
the
> > designation M393)
> > >
> > > So.. I'm guessing this is the rotational positional counter gizmo
(forgive
> > me for not knowing the correct terms).
> > >
> > > Anyway, can I use this? any tricks to figure out the pinout (looks
like
> > about 5 pins of a 10 pin ribbon cable are connected)
> > >
> > > - jim
> >
> >
> >
> > Jim:
> >
> > If the clear disk that is attached to the shaft has marks or "slots" on
it
> > then the "gizmo" is almost certainly an encoder. Most likely it is a
> > quadrature incremental encoder.
> >
> >
> > Randy Abernathy
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> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
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