Homebrew PCBs

On Thu, Apr 15, 2010 at 3:09 PM, Leon Heller <leon355@...> wrote:

> On 15/04/2010 22:10, James wrote:
> >
> >
> >
> > You don't even need transparencies. I've used ordinary laser printer
> paper, a friend of mine has better results using tracing paper and laser
> printing on that. You have to make sure you print it so the toner side is
> against the board when you expose, and weight a piece of glass over it to
> hold the pattern completely flat against the board. Once you figure out the
> correct exposure time it can produce very consistent results.
> >
> > Bubble tank is easy, I built one out of acrylic but I've seen people use
> those narrow rectangular food storage containers with an aquarium air pump
> and heater. The heat is the most important part.
>
> When I used a laser printer for transparencies I got good results with
> tracing paper. I have heard of people putting cooking oil onto artwork
> printed on ordinary paper, to make it translucent. I tried it once, and
> it worked, but it was a bit messy.
>
> Leon
> --
> Leon Heller
> G1HSM


I went to my local $.99 store and purchased a cheap picture frame w/ two
pieces of glass.  I used two plastic spring loaded clamps to hold my PCB
sandwich together.  I find those clamps are perfect.  I have heard the
tracing paper trick.  I actually have those OH transparency sheets laying
around because I teach school.  But I am stuck doing one at home I will give
it a try.

Is there a adjustment factor when using tracing sheets instead of
transparency sheets?

Thanks,
Chris Maness
KQ6UP


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