Homebrew PCBs

One very important aspect is how you make the negative?  I am using Vellum 
drafting film trade name is  "Clearprint" or "Dietzen" brand.  I am curious what 
otheres might be using to make there negatives with?


For those interested in youtube videos of my Homebrewed Printed Circuit Board
fabrication, PIC chip experiments, High powered LED projects, Arduino
applications, QRP kit builds, and Electronics Tourism, Please take at look and
subscribe to my new improved youtube channel "Hamradio2008"
link...
http://www.youtube.com/user/HamRadio2008
heres a current video; Back from Silicon Valley:
Back from Silicon Valley _ LeCroy WaveAce 112
http://www.youtube.com/watch?v=MQ2-a1oB57Q

 



________________________________
From: Leon Heller <leon355@...>
To: Homebrew_PCBs@yahoogroups.com
Sent: Sun, May 8, 2011 6:23:56 AM
Subject: Re: [Homebrew_PCBs] Length of sunlight exposure of photosensitive 
boards

  
On 08/05/2011 00:01, James English wrote:
> Hello, I'm new to this group, though not new to electronics. Does anyone out 
>there have experience with exposing a photosensitive board through a negative to 
>sunlight? A man at Injectorall told me that about six minutes at noon on a 
>bright sunny day but that doesn't seem to work.

It depends where you are, to some extent. I think it takes a lot longer 
than that.

Make yourself a UV exposure unit like this one of mine:

http://www.leonheller.com/Photos/UV%20unit.jpg

It'll work a lot better.

Leon
-- 
Leon Heller
G1HSM



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