Hmmm?
"Masking" tape is generally made of crepe paper that
has crenulations that are bigger than my entire trace
width.
I suppose some kapton tape pieces could be arranged to
make some sort of mask...
Thanks for the idea... I will think on it.
-Chuck Harris
On Tue, 16 Jul 2024 08:07:06 -0500 "Dave Casey" <polara413@...>
wrote:
Use masking tape to define your trace width.
Dave Casey
On Tue, Jul 16, 2024, 7:55 AM Chuck Harris via groups.io <cfharris=
[email protected]> wrote:
Hi Gang,
I need a workable conductive paint for use on repairing a
really tiny flexible circuit board trace.
Due to a flaw in manufacturing, a small bit (about the diameter
of a human hair) of a conductive trace is once again missing.
About 10 years ago, I fixed the problem with a conductive silver
paint, and a brush made from one of my arm hairs. The whole
operation was right at the limits of my abilities to manipulate
things by hand. Now, it is 10 years later...
The first time, I was vexed by the quickness with which the
paint's solvent evaporated, and skinned over. I got the job
done before, but it looked like a clotted mess.
What I would like is a one part conductive paint that flows, and
works like water or ink, but has a working time of 30 seconds, or
so... while making a hair thick trace... which isn't quite the
same thing as making a 1/16th in brush stroke...
Conductive thermosetting epoxies look promising, but I don't know
how they were meant to be applied, or what working with them is
like. The board is orange, like kapton (polyamide), but I don't
really know what its temperature limits are.
The trace is exactly the same width as one of my descended from
northern European diaspora arm hairs... about 0.04mm.
Ideas?
-Chuck Harris
