Homebrew PCBs

Hi all,
Anyone heard of a chip called a L7180 that used to be made by SGS? I have a board with about 40 on it and thought that it could be good to drive steppers but I have no info. When I saw the circuit with the L298's on it I went to the junk store and dragged it out. I think it may have come from a Line Printer. There is also a driver chip called a L6503 Have tried searching the net and Chip Directory et. but no luck so far. Seems a shame to toss it out.
I've been following this group with great interest trying to learn a bit about CNC and thinking about building a machine to drill circuitboards and cut out parts for model aeroplanes. I have built various stepper drivers in the past mainly to rotate bits on scientific instruments.
Cheers,
Paul Waller
University of Tasmania
Australia.


[Non-text portions of this message have been removed]

Hi Paul,
        Sounds like the board you have drives the hammers of
the spinning heads. When you say line printer, do you mean the
ones that print a whole line at once? I used to wear headphones
when I worked on them. The Driver boards had large output 
transistors. I suspect the stepper controller would also. Sounds
like you have the board that goes between the charactor generator
and the driver transistors.

                                                John 


--- In Homebrew_PCBs@y..., "Paul Waller" <paul.waller@u...> wrote:
> Hi all,
> Anyone heard of a chip called a L7180 that used to be made by SGS? 
I have a board with about 40 on it and thought that it could be good 
to drive steppers but I have no info. When I saw the circuit with the 
L298's on it I went to the junk store and dragged it out. I think it 
may have come from a Line Printer. There is also a driver chip called 
a L6503 Have tried searching the net and Chip Directory et. but no 
luck so far. Seems a shame to toss it out.
> I've been following this group with great interest trying to learn 
a bit about CNC and thinking about building a machine to drill 
circuitboards and cut out parts for model aeroplanes. I have built 
various stepper drivers in the past mainly to rotate bits on 
scientific instruments.

> Cheers,
> Paul Waller
> University of Tasmania
> Australia.
> 
> 
> [Non-text portions of this message have been removed]

Paul Waller wrote:
> 
> Hi all,
> Anyone heard of a chip called a L7180 that used to be made by SGS? I have a board with about 40 on it and thought that it could be good to drive steppers but I have no info. When I saw the circuit with the L298's on it I went to the junk store and dragged it out. I think it may have come from a Line Printer. There is also a driver chip called a L6503 Have tried searching the net and Chip Directory et. but no luck so far. Seems a shame to toss it out.
> I've been following this group with great interest trying to learn a bit about CNC and thinking about building a machine to drill circuitboards and cut out parts for model aeroplanes. I have built various stepper drivers in the past mainly to rotate bits on scientific instruments.
> Cheers,
> Paul Waller
> University of Tasmania
> Australia.

For even more info on home cnc in general, get the
yahoo list cad_cam_edm_dro.

Paul,

According to http://www.vego.nl/7/7_110.htm the L7180 is a Darlington
Driver...

L7180  4 x 80 V darlington-driver

Can't find anything about the L6503...

hansw

Paul Waller wrote:

>  Hi all,
> Anyone heard of a chip called a L7180 that used to be made by SGS? I
> have a board with about 40 on it and thought that it could be good to
> drive steppers but I have no info. When I saw the circuit with the
> L298's on it I went to the junk store and dragged it out. I think it
> may have come from a Line Printer. There is also a driver chip called
> a L6503 Have tried searching the net and Chip Directory et. but no
> luck so far. Seems a shame to toss it out.
> I've been following this group with great interest trying to learn a
> bit about CNC and thinking about building a machine to drill
> circuitboards and cut out parts for model aeroplanes. I have built
> various stepper drivers in the past mainly to rotate bits on
> scientific instruments.
> Cheers,
> Paul Waller
> University of Tasmania
> Australia.
>
>
> [Non-text portions of this message have been removed]
>
>
> To unsubscribe from this group, send an email to:
> Homebrew_PCBs-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


[Non-text portions of this message have been removed]

Paul try this web site he talks about a L6203. Are you sure it is a L6503?
There is a schematic to download here.
http://www.pilotltd.net/cnc.htm
Derek

   There is also a driver chip called a L6503 Have tried searching the net
and Chip Directory et. but no luck so far. Seems a shame to toss it out.
  Cheers,
  Paul Waller
  University of Tasmania
  Australia.


  [Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]