In a message dated 2/11/2005 12:03:12 A.M. Central Standard Time,
naveedguy2@... writes:
or is there any other technique to transfer the PCB to the board. Thanks.
If you have a Radio Shack (Tandy) store within reach, their
pressure-sensitive circuit patterns are the best thing since Swiss milk-chocolate! With
those, you can "rub-on" a PC pattern as fine as any photographic method. But it
DOES mean only a ONE-TIME pattern, of course. You must first clean the
copper with some household cleanser such as Comet, etc., then rinse that
SUPER-well, and dry, and I usually at least "wipe" the surface with lacquer-thinner
(acetone should do), and dry. Then, apply the "rub-on". then etch.
It is best to WARM the ferric chloride solution to about 38-40°C. It will
work much faster. If hotter, it might loosen/remove the rub-on stuff. Not
sure. I'm too shy to try!
Now the "professional" way to do PCB's is to make a 2x or 4x "artwork" and
then make negative films with which you "contact-print" onto a photo-sensitized
etch-resist over the copper, but to do this successfully, one must have
experience, and a professional PCB house to do the actual "printing" and
etching. Best, find a PCB house that will allow you to come over and gawk and ask
questions. Many won't HEAR of such a nice accomodation to other than a
$250K/year customer, but some will treat young hobbiests with civility. TRY it!
Jan Rowland
[Non-text portions of this message have been removed]