Homebrew PCBs

Hi All

Am I missing something here? surely if the print is turned over then one way or the other the 
circuit will be wrong.

Regards Alan

To:             	Homebrew_PCBs@yahoogroups.com
From:           	"tboneuk_2000" <a_reynolds@...>
Date sent:      	Wed, 04 Feb 2004 21:21:44 -0000
Subject:        	[Homebrew_PCBs] Re: Dissapearing Tracks in deveoper
Send reply to:  	Homebrew_PCBs@yahoogroups.com

> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
> <stefan_trethan@g...> wrote:
> > On Wed, 04 Feb 2004 17:06:49 -0000, tboneuk_2000 
> > <a_reynolds@b...> wrote:
> > 
> > > I have just looked at the film I used and discovered the print 
> may
> > > have been the wrong way around. I presume the ink should have 
> been
> > > next to the board, I had this the other way around so the light 
> hit
> > > the ink printed on the film then had to pass through the 
> transparent
> > > film itself before hitting the board.
> > > Am I right in thinking this would effect the exposure 
> efficientcy or
> > > will it not make any difference?
> > >
> > >  Kind regards
> > >
> > >  Tbone
> > >
> > >
> > 
> > it is better to put the ink to the board because of undercutting 
> of light, 
> > however i have made
> > a few boards the wrong way around and it always worked...
> > it should not affect the result in larger copper areas (e.g. a 
> pad).
> > 
> > ST
> 
> Although it may not make a differance I fliped the film over, so the 
> ink faced the board.
> My original trial board was exposed for 4 to 13 mins at 1 min 
> intervals, now I tried exposing another board for 12 to 30 mins in 2 
> min steps.
> Still not developing, should I see an image of the transfer (even a 
> faint image) before developing the board ?
> One thing that may be worth mentioning is that for this second trial 
> I used the same deveoping solution that I used for the first (is it 
> normal to do this or should I have made anew batch for each 
> development)..?
> The original board had an image for few seconds then seem to 
> dissapear in the solution, this new board exposed for longer had no 
> such image. Could it be I need to expose for a much shorter time <4 
> mins ?
> 
> Kind Regards 
> 
> Tbone
> 
> 
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