A case in point is this super-low-cost RF power sensor that [Tech Minds (M0DQW)] recently built. It’s based on a design by [DL5NEG] that uses a single Schottky diode and a handful of passive ...

A research team has successfully developed the world's first ammonia (NH3) gas sensor based on a copper bromide (CuBr) film that can be fabricated through a simple solution process at low temperatures ...