Rollerball pen draws electronic circuits on paper
Love this kind of thing:
A team of researchers from the University of Illinois have created a pen with conductive silver ink that can be used to draw electrical circuits on paper, wood and other materials. Although similar pens are already available, the difference here is that the ink is bendable when dry, meaning that even if the paper is folded or bent, the circuit will still function normally.
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The researchers have also been able to add components to their hand-drawn circuits, including a flexible LED display, three-dimensional radio-frequency antennas and a battery.
