Speaking of PCBs...

[Rene Schmitz]

At 07:07 16.09.99 -0400, terry michaels wrote:
>Message text written by "Fraser, Colin J"
>>I use a Laserjet 1100 to print out the foils - at the highest toner
>density
>setting I get good results, but you need to be careful that your printout
>is
>opaque enough to prevent any UV getting through the image.
>
><
>
>I have that problem with my Laserjet IIIP.  Large foil areas usually don't
>print dense enough, so sometimes I fill in and darken these areas with a
>Sharpie permanent marker pen.
>
>Terry Michaels
>

I've got the same problems with a LJ series 2. For see-thru foils I usually
print two (or even three) foils and stack these. As UV source I use a Photo 
1000W quartz lamp. 40-60 seconds is usual exposure time. 

I've lately done many boards with the direct toner transfer, using label
backing stuff. I also have the trouble that traces break and lift off of
the backing, but one of three attempts is nice, and the process is cheap,
so I print it until I get a usable version. The lower toner settings work
best for me. This process is very nice and quick, so that I sometimes even
build prototypes with it. I often have to correct little flaws using a
permanent marker.

Bye
 René
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