Homebrew PCBs

cristian wrote:

>>  Just did a little looking, and sure enough the UV LEDs I have are in
>>the correct range for exposing a board.
>>    
>>
>
>Alan, please be more specific: have you tested with positive results?
>At what resolution?
>What UV power and how long for, let say 10x16cm, 50% traces board?
>How is your focusing device?
>Cristian
>  
>


  No tests, the light output of the LED is simply in the same 390-420 nm 
range needed for the film coating exposure.

  There's a ton of output power in a UV lamp etc etc etc.  And they use 
that and not wanting the film to go bad at the drop of a hat, and of 
course it's slow.  UV has higher energy than visible light, little doubt 
it'd be fairly trivial technically to do UV film that's dozens or 
hundreds of times faster than what is normally used.  Maybe a different 
story in cheapness and practicality, but no doubt possible.  Even the 
normal is probably fine enough for overnight doings for a 2"x2" board or 
similar with multiple LEDs..

  Again, wouldn't do it practically since the inkjet seems to be looking 
good, but little doubt it's doable.  Should've done it two years ago 
though..

Alan