Homebrew PCBs

There is no number on the lamp.  It's bright white.  

Richard



  ----- Original Message ----- 
  From: John P. Anhalt 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, March 04, 2007 6:02 PM
  Subject: Re: [Homebrew_PCBs] sensitized boards


  Thanks for the information, Richard.

  That is interesting. In graduate school, we used "sun lamps" for near UV. The reactions we were studying were similar to what I understand is the basis for most positive-resist boards. I am surprised there is enough absorption of "infrared" to make the photochemical reaction go, or alternatively, enough near UV from an infrared lamp. Does the lamp have a reddish glow, or is it a brighter white? If you have the actual lamp number (which should be printed on the face of the lamp), I will check it out.

  John 

  ----- Original Message ----- 
  From: Richard 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, March 04, 2007 5:52 PM
  Subject: Re: [Homebrew_PCBs] sensitized boards

  250 watt 120 volt GE Infared Heat Lamp.
  Spaced 11" from the pc board with an exposure time of 75 to 90 seconds. I generally do the 90 seconds.
  I bought it at Walmart about 10 years ago and it's still going strong.

  Richard

  ----- Original Message ----- 
  From: John P. Anhalt 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, March 04, 2007 9:11 AM
  Subject: Re: [Homebrew_PCBs] sensitized boards

  Richard,

  Can you give a little more detail about the heat lamp that you use, such as brand, wattage, and identifier number on it?

  Thanks.

  John

  ----- Original Message ----- 
  From: Richard 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, March 04, 2007 9:40 AM
  Subject: Re: [Homebrew_PCBs] sensitized boards

  I use Infared Light to expose my positive sensitized boards because I can expose them in about 90 seconds using a IR heat lamp.

  Richard

  ----- Original Message ----- 
  From: docstein99 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Thursday, March 01, 2007 11:28 AM
  Subject: [Homebrew_PCBs] sensitized boards

  I was wondering if anyone can give me some advice, looking at the 
  threads recently it looks like lots of people here have tried 
  sensitized boards.

  This material appears to be the same stuff as silkscreen printers use 
  on silkscreens, where the exposed areas to intense light are hardened 
  and the unexposed areas are washed away with water.

  Do any of the sensitized boards or materials react to INFRA-RED light? 
  I have an infra-red laser diode on a cnc machine, its not powerful 
  enough to cut stuff with but will smolder black foams. I was wondering 
  if its possible to use that to rastorize the image, but I dont know 
  about all the different types of sensitizer or what types of lights 
  they react to. I know in screen printing, they make types which react 
  to a 4k watt metal halide bulb, and newbie stuff that works with a 150 
  watt lightbulb.

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