Re: Help understanding servo motor

That makes sense except that the outputs should have pull UP resistors. If
it is an LM393 you should be able to deduce the power and ground from the
chip's pins.
--
Phil Mattison
http://www.ohmikron.com/

----- Original Message -----
From: James Washer <washer@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, November 28, 2006 5:19 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor


> BY GEORGE I THINK YOU'VE GOT IT!!!!
> I've not sketched out the full schematic yet, but.... assuming it is an
LM393, then there are two caps, each across the inverting/noninverting
inputs, pulldown on the outputs before going back to the connector.. all
makes sense (mostly).. I think I'm about ready for a smoke test
>
> THANKS!
>
> - jim
>
> On Tue, 28 Nov 2006 14:27:47 -0700
> "Phil Mattison" <mattison20@...> wrote:
>
> > 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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