Homebrew PCBs

Andrew wrote:
>>>Someone wrote:
>>>
>>>Okay.   Is anybody using a laser engraver
>>>to run off PCBs?
> 
> 
>>Chris H wrote:
>>
>>I've tried it with a 25W CO2 laser (a piece of
>>equipment that costs more than my car, and
>>holds it's value better) and it doesn't even
>>touch the copper.  Flip the board over, and
>>it will cut right through the fiber though.
> 
> 
> Copper side just reflecting that wavelength huh.
> 
> Maybe needs an orange laser with a wavelength
> that will be absorbed.
> 
> Alternativly you could make the copper unshinny.
> Maybe a thick layer black toner on the copper.
> Possibly use toner transfer paper to put on a
> negative PCB image and then the laser will
> burn off the copper underneath the black.
> 
> andrewm (sitting back and waiting for replies :)

You could just burn off the black coating resist as
tracks, then etch the pcb as usual. (laser scratch-
and-etch).