Homebrew PCBs

On Sun, Jul 7, 2013 at 8:37 AM, epa_iii <palciatore@...> wrote:
>
> Oh, and do be sure that the emulsion or printed (ink/toner) side of your
> negative/positive is the one in contact with the board.
>
This is the single-most important piece of advice related to contact
printing anything photographic. We used to specify that pcb negatives be
"R/R/E/D"--"right-reading emulsion down." That is, when the negative is
flipped so that is reads as the pcb should read, the "emulsion"--or the
printed deposit of ink, toner, etc.--should be down facing the pcb and not
up facing you. The reason is that light--collimated or not--will diffuse
through the thickness of the film resulting in a blurred print.

I'm with the spirit of Paul's reply that simple equipment is all that's
needed here for a nearly-perfect result. Though I understand (and suffer
from) the malady myself, this is a case in which there should be less
perfectionist hand-wringing and more hands-on doing.
http://www.setsailcoaching.com/maximizing-vs-satisficing-how-happy-are-you-with-your-decisions


73,

Todd
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K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
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QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design


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