--- In
Homebrew_PCBs@yahoogroups.com, "Ben" <bhleavi@...> wrote:
>
> --- In Homebrew_PCBs@yahoogroups.com, "Leon" <leon355@> wrote:
> >
> > ----- Original Message -----
> > From: "derekhawkins" <eldata@>
> > To: <Homebrew_PCBs@yahoogroups.com>
> > Sent: Monday, February 05, 2007 7:55 PM
> > Subject: [Homebrew_PCBs] Re: Photo exposure
> >
>
> I have to agree that positive photo method if far easier and better
> than TT. I read on here what some seem to go thru to do the TT
> method to get good results. I find the positive photo method much
> much easier. I guess if you don't do this much TT might be a way to
> go but if you do boards very often and have a place you can setup a
> exposure frame and a etching tank you can produce boards very easily
> with better results. For most it seems that TT method is hit and
> miss on getting a good board as can be seen in the photo of that one
> post. I know that there or some on here that seem to really have
> the TT method down and have good results, but I have a idea that it
> took them a while to get to that point too.
>
> Ben
>
Hey Ben, Thanks for the note on the yellow inkjet for UV ... that's
interesting. I wouldn't have guessed that yellow would be better than
black???
I agree, I've seen some really good TT examples that make it tempting
but it seems a lot of people really struggle with it. I tried it a few
years ago with the Pulsar TT that is easily available from DigiKey. My
results were always about the same, about 98% effective. There were
always a few spots that the toner just didn't bond well to. I also
usually got some etching at the edges. The photo process never did
this and the learning curve is only a couple of boards. Once the
exposure time is dialed in, the rest is pretty straight forward.
I like the one tip of printing 2 artworks and then stacking them. I'm
going to give that a shot with the laser. Should eliminate pinholes
100%. Going to try the
btw - Just switched to DipTrace myself. So far I like it. If you
really wanted yellow, there's a program out there called GC-Prevue.
It's a gerber viewer (the viewer is free) and I think it would allow
selecting different colors for printing. Only hitch is it requires a
gerber and there's no gerbers in the free DipTrace.
Bert