> Hi,
> I want use transparent film to print a PCB on it, but in negative.
> (nets, pads, text etc. -black, no cooper- transparent). I was doing
> it with Orcad and this work good. One man was doing PCB from this
> film for me. Unfortunately, Protel I tried to use doesn?t seem to
> have such option. What can I do? plot it to Gerber file, and
> translate it to pcx and use other application to make negative and
> print? print to file (I have HP5L) and use other program(I haven?t
> idea which?) to print in negative? maybe make ALT+PRINTSCREEN and
> paste it to Paintbrush, make negative and print (I use Windows) ;-)
> Any idea very welcome!
>

Forget software approaches.  Get some reversing film from KEPRO.
This is how I do all my in-house prototypes.

1.  Print a positive (copper-black) on drafting mylar with a laser
printer

2.  Place it on reversing film and expose to UV.

3.  The reversing film comes out with the copper areas clear and the
non-copper areas opaque.


Kepro Circuit Systems inc.
kepro@worldnet.att.net
3640 Scarlet Oak Blvd
St. Louis, MO 63122-6606
(314) 861-0364 voice
(314) 861-9109 fax

Best Regards,

Lawrence Lile