Homebrew PCBs

I did a bit of this in my college days.  We used orthographic film
(Kodalith, I think) that was not sensitive to reds and had very high
contrast.  It was fairly easy to use for me and give great results.  I made
contact prints from mylars taped with Bishop tapes and pad layouts.  I used
it under a ruby light with a carbon filament.  (Something my Dad had in his
basement photo area, along with an old enlarger and developing trays.)  Ahh!
The good old days.

 

Andy

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Tuesday, April 12, 2016 4:23 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] images for photoresist

 

  

That is simple to develop.i haven't done it in a while but it was d76
developer , stop bath and fixer . you have to work in total dark until the
fixer. If the size is 8 by 10 you could put it in a photo processing drum
and let a motor do it for you. You would just need to drain the chemicals at
the proper time.

A friend of mine used to do it with lithograph film . I don't think it was
as touchy and it could be handled under a yellow light if I recall.

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew! _PCBs@yahoogroups.com]

Sent: Tuesday, April 12, 2016 5:24 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] images for photoresist

 

  

On Tue, 12 Apr 2016 17:13:31 -0400, you wrote:

>I'm using laser transparencies for photoresist boards and I would like to
>test a real photographic film image. I understand real film has solid black
>this is excellent at blocking light. Can anyone suggest a type of place
>that can do photonegatives from a .jpg or .bmp? Can a CVS or Riteaid do
>this? 

You want a professional place, one that does drawings, engineering
prints, and the like. They're likely to have the ability to make the
image. Photolithographers, for instance. Riteaid or CVS barely know
how t! o develop Tri-x Pan.

Harvey

>
>Jeff