Homebrew PCBs

"tda7000" <Tda7000@...> writes:
> I didn't mention it before but I did a rudimentary test by covering
> the board with a credit card and exposing a little bit every minute
> for 7 minutes (chose that time as I saw a site where someone who made
> a UV box with LEDs say 7 minutes was the maximum they could go before
> overexposure)

My UV LED box exposure is about 5 minutes.

> A custom printer-driver sounds great, I don't suppose yours is available and is for Canons?

http://www.delorie.com/pcb/pbm2escp2.zip

> I wonder though if I somehow could force the printer to print black by
> mixing the colour cartridge it would be like getting 3 layers of
> artwork, from the 3 different inks. Not sure how to do that though.

Depends on the ink and print head.  I find the black is sufficiently
dark if you can put enough down, and only yellow has any UV blocking of
the other colors.  Cyan and magenta are a waste of time for UV.  Of
course, this is with my inks (claria); others vary.  Plus you have to
carefully align the various print heads to get the ink in the right
spots.

Remember, UV doesn't care about the colors you see!  It only cares about
the UV transmission, which does not always correspond to any visible
transmission.