Printing a circuit on clear plastic?

Hi Guys

Inside most modern keyboards, you find a rubber membrane that presses a sandwich of three layers of plastic, with the upper and lower parts having circuits on them that make the contact.

Is it possible to 'print' this type of circuit at home on standard laser or inkjet printers?  I could use Amanda's method with bare conductive ink, but printing would be better.

Any info appreciated ;)

TolMera1 year ago

Silk Screen - They use a silk screen to 'print' the circuit on the plastic membrane... (took so much Googling to find that out.)

Take a black and white printer empty the ink cartridge and fill it with conductive paint or ink.

I don’t know if Bare conductive paint will work but there are a number of conductive inks in use industrially.

wizer (author) 3 years ago
Thanks. Well it works in a keyboard pretty well. I need it for that exact purpose, to layout a large array of buttons, like a keyboard, but not for typing. I can take out the membrane and circuit from any keyboard, but am limited to the keyboard's layout.

I was thinking that laser etching onto an acetate sheet might be a way to do it. Will have to experiment.
Sure if you can find a compatible ink cartridge for your printer that has conductive ink in it. I doubt any exist.

The plastic membrane in a keyboard isn't really a circuit. It's just a matrix of contact points. It's not like you can solder any components too it. Nor would you want to. It makes for a lousy sub straight prone to failure.