Homebrew PCBs

From: demers_barry <sdad@...>
Subject: [Homebrew_PCBs] Positive photo method paper
To: Homebrew_PCBs@yahoogroups.com
Date: Saturday, October 3, 2009, 3:55 PM






 




    
                  For what its worth.....



I have had tremendous results using a vellum paper from SMR.  

try this link and start reading: http://www.smrsoftw are.com/vellum. php

I use an HP 2600 color laser, set for recycled paper (I'm using Ubuntu 9..04, so you'll need to fiddle in Wyndurs), and I do spray a matte fixative after to "darken" up the toner.

My last board has trace widths < 5 mils.  I printed to the vellum such that the toner side is on the copper during exposure. I was careful on watching the exposure and developer time.  BTW I didn't need to increase exposure time from using transparent film, not at all.



An inkjet attempt should prove interesting



Compare the prices on this vellum to that of laser transparency film, yikes!




 

      

    
    
	
	 
	
	








	


	
	


      

[Non-text portions of this message have been removed]

From: demers_barry <sdad@...>
Subject: [Homebrew_PCBs] Positive photo method paper
To: Homebrew_PCBs@yahoogroups.com
Date: Saturday, October 3, 2009, 3:55 PM






 




    
                  For what its worth.....



I have had tremendous results using a vellum paper from SMR.  

try this link and start reading: http://www.smrsoftw are.com/vellum. php

I use an HP 2600 color laser, set for recycled paper (I'm using Ubuntu 9.04, so you'll need to fiddle in Wyndurs), and I do spray a matte fixative after to "darken" up the toner.

My last board has trace widths < 5 mils.  I printed to the vellum such that the toner side is on the copper during exposure. I was careful on watching the exposure and developer time.  BTW I didn't need to increase exposure time from using transparent film, not at all.



An inkjet attempt should prove interesting



Compare the prices on this vellum to that of laser transparency film, yikes!




 

      

    
    
	
	 
	
	








	


	
	


      

[Non-text portions of this message have been removed]