Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor

every chance they were pullups.. I just noted the resistors on the outputs and made an assumption

On Wed, 29 Nov 2006 09:48:45 -0700
"Phil Mattison" <mattison20@...> wrote:

> 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.
> > > > >
> > > > >
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