Re: Help understanding servo motor

Is it possible the logo is Motorola?

http://www.compactpci-systems.com/products/search/index.php?q=Systems%3A+Programmable+automation+controller&op=cn&max=40

An M393 8 Channel ADC M-module?

John




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "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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there, for OT

> subjects, that are not allowed on the CCED list.
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