The Michigan lab that introduced the notion of beetle-generated power for remote-controlled, insect-borne reconnaissance sensors is back—this time with an idea to generate energy from low-frequency ambient sound. Researchers at the University of Michigan Center for Wireless Integrated Microsystems plan to publish a scheme for a low-frequency-powered ceramic piezoelectric generator in an upcoming issue of the Journal of Microelectromechanical Systems. Piezo devices made of ceramic or ...

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