Homebrew PCBs

The positive resists I am aware of are all 375 nm or greater.  NB: incandescent lamps may put out to 350 nm.  I use Injectorall, and it recommends something around 390'ish nm. ±20nm is not going to make much difference.  Injectorall also allows exposure with ordinary incandescent lamps.

John


  
  ----- Original Message ----- 
  From: Dave Sage 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Saturday, February 25, 2012 10:16 AM
  Subject: [Homebrew_PCBs] Re: Novel way to expose photo resist??


    
  SO, can anyone quote the required wavelength of light required for some UV
  photo resists? The MG Chemicals exposure light is 375nm. I think it will do
  both their pre-coated positive resist boards and their negative dry film
  resist. Of course positive pre-sensitized boards are of no use to the laser
  plotting technique proposed.

  Sage

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