The surface microphone described here is a form of contact microphone based on an ordinary 35-mm piezo disc. You can glue the piezo disc using double-sided thick adhesive tape on a surface to catch ...

IT is not absolutely necessary that the microphone should form part of the direct circuit. It works just as well if connected so that, when the carbons are not touching, the whole of the current ...

From a purely electrical standpoint, a typical piezo will easily survive at least 75V. But the piezo material will crack if subjected to excessive mechanical stress, and since it converts voltage ...

Vesper of Massachusetts is claiming high fidelity for a MEMs piezo microphone that picks up the vibration of the user’s voice through the skull. Inside is the mems, an amplifier and a power regulator.