Can you posts pics please? I'm really curious as to how it came out. I'm
trying out the Pulsar technique right now and I like it. I had some
messing-up around the edge 'cause my PCB was VERY corroded; I cleaned it for
as long as my arms could handle. But I have another brand of PCB and it is
obvious that the first one was VERY old.
I'm also switching to 1/32" thick PCB. The GBC H300 laminator does NOT
digest 1/16" boards very well; it burped and farted the whole time, having
to force-feed it by hand with another blank board.
Robert
:)
-----Message d'origine-----
De :
Homebrew_PCBs@yahoogroups.com [mailto:
Homebrew_PCBs@yahoogroups.com] De
la part de hjf2k2
Envoyé : juillet 23 2005 13:19
À :
Homebrew_PCBs@yahoogroups.comObjet : [Homebrew_PCBs] Experimental method
Hi all, i've been testing a way to make photo etching cheap'n easy. I went
to a Screen-print shop and bought photosensitive emulsion, the cheapest
type. I mixed the components and painted the emulsion on the copper. Then I
let it dry overnight in a (pitch) dark place. On a transparency I printed
the negative of my circuit and placed the transparency, toner side to the
emulsion and placed it under a fluorescent lamp for 7 minutes or so. I
removed the board and nothing seemed to change, until I ran some water over
the board, and with a hair brush for babies (the softer-than-hair type) i
helped the water. The exposed areas dried up but the rest washed with water.
GREAT precision, SMD quality. Then I let the board again now in the sun to
totally burn the emulsion and it was ready for etching, warm (hot) ferric
chloride.
Hope that helps.
Some day I'll try the AZO-based emulsion, but that one needs UV curing.
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