Homebrew PCBs

When I used to expose the photo resist on the boards I used a sunlamp. I forget what the timing was though ,haven’t done this in many years.

 

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Friday, August 19, 2016 10:44 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] First Negative developement Brd

 

  

Forgot to add, cover glass can absorbe the UV required by the film, so you may need to experiment with that also..

Malcolm

I don't suffer from insanity I enjoy it! 
Mene, mene, tekel, upharsin 
The writing is on the wall. 
Ha-ktovet al ha-kir

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On Fri, 8/19/16, kbyrne10@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:

Subject: [Homebrew_PCBs] First Negative developement Brd
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, August 19, 2016, 1:36 PM


 









I finally have all the supplies that I
need and need a question
answered.SuppliesScotch
LaminatorOffice depot Black and white
copier transparencies. Two copies of each experiment
circuit.Dry film bought in
ChinaPH up bought on
E-BayEagle to Gimp
negativeDakta light bulb approx 12 in
above frame.Question? How long do I turn
on light bulb for first experiment in developeing
board.If it fails to develope properly
how much time do I add for next
experiment?What is correct procedure for
this experiment to learn this aspect properly?









#yiv9227428166 #yiv9227428166 --