Thanks Roel,
I will try an unexposed piece tommorow, the instructions stated 10mg
of developer per 100ml of water. I did not have any scales to
measure this amount so I could have put too much developer in the
solution.
I have also just found another post that has had similar problems to
this but he had the developer solution to hot, mine was around 20°c
room tempreture so I do not think that is the problem.
--- In
Homebrew_PCBs@yahoogroups.com, "roel_cnc" <atmelletje@g...>
wrote:
> Hi Tbone,
> put in the developer a unexposured pcb, it may not disolve the
resist
> if it dos its to strong
> I think your to short in exposure time or maybe lights to far away-
> 3 to 4" is normal distance
> And be shore that the daylight must be tempered a bit
>
> please excuse my bad english.
>
> gr. Roel
>
> --- In Homebrew_PCBs@yahoogroups.com, "tboneuk_2000"
> <a_reynolds@b...> wrote:
> > Hello all,
> > Wondering if anyone could point me in the right direction.
> > To find the correct exposure time I made up a strip of inkjet
> > transparent film with 10 identical dill sockets plus some lines,
> > placed this over a strip of "fotoboard 2" board (with glass
holding
> > it all together) and placed it under a 2∗ 8W uv light for
between 4
> > and 13 mins (uncovering each dill socket every minuite). I made
up
> > the developing solution ratio 10:1, and placed the board in a
glass
> > dish containg developer.
> > After about 1 min I started to see my image appear on the board
and
> > a bluish residue around the exposed print. This seemed ok but did
> > not develop any more as left it in the solution for a couple of
more
> > mins, then the print slowely started to dissapear to nothing. I
> > tried etching anyway but all I got was a nice clean board
striped of
> > all copper and no tracks/sockets at all.
> > At least I know how to etch the board but I am confused why the
> > image started to develop and then dissapeared.
> >
> > In case it helps I used fotoboard 2, pcb developer and pcb
etchent
> > from maplins ( the products are made by chiltern and I had a 1:1
> > ratio of etchent to water)
> >
> > Any help graetfully received
> >
> > Kind regards Tbone