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This article explains what a lithium-ion capacitor is, its features (fast charge/discharge, long life), and compares it to other power storage devices like lithium-ion batteries and EDLCs, highlighting JTEKT's Libuddy model.
An ESP32-powered alarm clock that wakes you up by discharging a capacitor through a loud bang. The project includes a custom PCB, 3D printed case, and web interface for configuration.