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Articles tagged with: pen

Pen That Can Doodle Live Circuits On Paper

Gel pens, beloved by middle-school kids, are good for doodling in class, and not much else. But if you replace that metallic ink with real silver, you get something quite remarkable: a pen that can draw functioning circuits on paper.

Engineers at the University of Illinois have built such a device and used it to put together several clever electronic doodads. Silver is a conductor, so it ferries electrons from a power source, like a battery, to an outlet, like an LED light, even when it’s just a line on a piece of paper instead of a wire.