> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Herbert Graf
> Sent: Monday, 6 January 2003 1:00 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: PCB exposure/developing timing?
>
>
> > I would try tracing paper in the laser printer first. My Brother HL1440
> > works well in 600 x 600 mode for my surface mount PCB's, and I
> still have
> > the option of going up to 1200 X 600 (although this slows the
> print speed
> > down too much)
>
>         Tracing paper works? That's an excellent idea if it works
> with ink jets
> since ink jet transparencies are so bleeding expensive. I don't know how
> much bleeding would occur. How about regular paper, how
> transparent to UV is
> it? TTYL

The problem I had with regular paper is it has inconsistent grain and
blotches, these would show up as areas where the copper would not etch away
cleanly esp between SM pads. Switched to Tracing paper, and shortened the
exposure (less than 60 seconds in my exposure unit) and all is kewl now
(just need to research tin plating)

Regards,

Kat.

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