Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor

The M393 is probably the 8 pin 2 gate version of the LM393 compartor.

I have seen this 2 gate version in some newer ATX powersupplies that I
scraped for the torids.

The toriads make nice filters for power line applications.

Hugh

James Washer wrote:

>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
>>4626 Old Stilesboro Road NW
>>Acworth, GA 30101-4066
>>E-mail: cnc002@...
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>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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