Abstract: Piezoelectric energy harvesting (PEH) is a technology that uses piezoelectric transducer to obtain electrical energy from mechanical vibration energy. It has a problem of power loss caused ...

A Planet Analog article, “2N3904: Why use a 60-year-old transistor?” by Bill Schweber, inspired some interest in this old transistor and how it’s commonly used, and if any uncommon uses might exist.

Abstract: In this work, a piezoelectric-capacitive hybrid micromachined ultrasonic transducer (HMUT) with a high round-trip gain was developed to achieve superior pulse-echo imaging performance.