After research, engineers at the University of Illinois in the United States designed this pen that can easily draw circuits. The pens "ink" is made of metallic silver, which can be used on a variety of materials such as paper and wood, and will not be affected even if it encounters wrinkled surfaces. Compared with the silver filling pen used to repair circuits, this pen not only makes it easier to plan circuits, but the circuits drawn are also durable. It can effectively reduce the cost of using simple circuits, open up ideas for flexible use of circuits, and even provide the possibility to create artistic circuits. At present, designers are still conducting further research and hope to make breakthroughs in "ink" to bring more types of circuit pens.
