Homebrew PCBs

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]