Hi All,
i find it interesting that no one has mentioned the
peel and press method of pcb making.
some boards are not etched and placed in a chemical
bath.
instead the board starts as a copperless plate and the
traces are on a sheet that carries the traces like a
rub on transfer.
the sheet has a protective layer that is removed and
then the sheet is lay'ed on the blank pcb and pressed
or rolled or vacuum pressure is applied.
then the holes are drilled.
after years of exposure to heat and air or even a bad
transfer to start with, the traces "bubble" and
wrinkle.
i have not seen too many computer boards or cards made
this way but alot of consumer audio and cb or marine
two way radio's are made with this style of pcb and
are a real pain to repair.
when the trace is heated to replace a bad component,
it wants to lift very quickly.
my guess is that the peel and press way is cheaper
then a real etched board.
Bill
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