Homebrew PCBs

Sorry as I posted to the list owner instead to the
list recipients.

The former messsage was as follows:

--- teknochaman <teknochaman@...> wrote:
> 
> > Hi All,
> > 
> > This is my first post here.
> > 
> > I'm newbie to PCBs but familiar with
> > > positive/negative
> > graphic film (former printshop manager)
> > 
> > Wanting to do home etching it's an intuitive
> 'upgrade
> > ' of my skills.
> > 
> > I'll use presensitized positive boards (epoxy
> > substrate) and I wonder where to go for knowing
> about
> > track thickness issues in terms of current passing
> > thru copper tracks.
> > 
> > I'd like having more solid foundations than the
>common
> > sense i.e. with wire (roll not flat ) it's known 1
mm = 1A, 2mm = 2A , etc.

> > Any equivalence for tracks or minimum distance >
>between tracks to avoid arcing ?

 
> > BTW  I'm also a DIYer of small microelectronics
> > projects. 
> > 
> > Being baby boomer hope some day having enough time
> to
> > build my own CNC based cutter (some day) one as
seen on today
> > posting.
> > 
> > For sure as an old eBAYer I assume that parts can
> be
> > found at the auction hub for the world.
> > 
> > TIPS are welcome.
> > 
> > Anybody is welcome to send me beginner's tip here
> or
> > in private to avoid disturbing with too obvious
> > matters regarding current postings.
> > 
> > Hope get here motivational resources which IMO is
> as
> > important as the knowledge in itself.
> > 
> > 
> > To fulfill forum requirements
> > (and to demonstrate that I'm a human
> > being rather than a bot) :)
> > 
> > 
> > My goals:
> > 
> > 1. To build a integrated light-timer to avoid
> doing it
> > manually (i.e. thru a 555 or the likes integrated
> > circuits)
> >  
> > 2. To upgrade my UV light source with a more
> powerful
> > metal-halide type to reduce exposing time
> > 
> > 3. If it should be of help I'd adapt my vacuum
> frame
> > it shou(for offset plates burning) to put there
> also ,
> > the film pressed against the copper substrate base
> if
> > that should help.
> >  
> > 
> > 
> > .SCH file extension 
> > question
> > *******************
> > 
> > I've seen at many DIY sites that PCB software is
> used
> > from a site of free download (.sch extension).
> > 
> > I'd say that at a first look expressPCB would be a
> > free software for layout, but seems to be
> propietary
> > software in terms of they expect people sending
> them
> > their files for production purposes.
> > 
> > Those .SCH files using that software (many
> published
> > at .DIY sites) can be routed to an ordinary
> printer ?
> >  
> > Let's say to get printouts ready to be put i.e. ,
> on a
> > polyester film  ?
> > 
> > I 've heard about Gerber, Tango (Protel), Eagle,
etc. files
> but
> > not of this so called "free" but orientated to be
> tied
> > a commercial purpose ., as it would be ordering
> PCBs
> > which is in fact the OPPOSITE to this forum goal,
> > where we intend to homebrew our own PCBs.
> > 
> > Bests, peace for all this Season and TIA
> > 
> > Samuel J.


P.S.

Sorry it's long, but think being my first post here
I'll get mercy !

a longer 

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