RickNel
Veteran Member
This from the latest Jameco newsletter:
I've recently used a silver polymer circuit pen to repair some corroded traces. It works, but has a number of limitations. It draws a line about 1mm thick, but this remains liquid (and non-conductive) for some hours, tends to spread a little on a lacquered PCB surface, and is difficult to keep straight and narrow. A pumping action is needed to feed the fluid to the felt tip, which also makes precise drawing difficult. The thick line would make it difficult to use for any typical TTL DIL socket pin spacing, let alone anything smaller.
Surely a conductive ink using carbon and metal powder should be feasible? I'd like a little pot of conductive ink that I could draw with a calligraphic pen nib - easy to clean, variety of trace widths.
I'll be watching for the retail version of MIT's circuit pencil - then we will see what "fairly cheap" means. Also whether it is erasable, which would be handy for design and prototype use.
Any other experience with conductive inks for drawing or printing?
Rick
A team of chemists at the Massachusetts Institute of Technology created a carbon nanotube "lead" that can be used to draw freehand electronic circuits using a standard, mechanical pencil.
MIT chemist, Katherine Mirica and her colleagues pulled off the amazing trick by using a special material called carbon nanotubes to replace the normal graphite pencil lead. Best of all, the special pencil lead is fairly cheap and easy to use, according to the MIT researchers.
I've recently used a silver polymer circuit pen to repair some corroded traces. It works, but has a number of limitations. It draws a line about 1mm thick, but this remains liquid (and non-conductive) for some hours, tends to spread a little on a lacquered PCB surface, and is difficult to keep straight and narrow. A pumping action is needed to feed the fluid to the felt tip, which also makes precise drawing difficult. The thick line would make it difficult to use for any typical TTL DIL socket pin spacing, let alone anything smaller.
Surely a conductive ink using carbon and metal powder should be feasible? I'd like a little pot of conductive ink that I could draw with a calligraphic pen nib - easy to clean, variety of trace widths.
I'll be watching for the retail version of MIT's circuit pencil - then we will see what "fairly cheap" means. Also whether it is erasable, which would be handy for design and prototype use.
Any other experience with conductive inks for drawing or printing?
Rick