Piezoelectricity (also called the piezoelectric effect) is the appearance of an electrical potential (a voltage, in other words) across the sides of a crystal when you subject it to mechanical stress. Both support manner and vibration(mechanical) manner will affect the output generate from piezo element.
There are 4 types of support manner:
*For round piezo electric generator, suggest to use (d) type (whole perimeter) support manner.
Mechanical/ Vibration manner:
- Instant impact can reach 30V, 5mA
- Normal generate; 0-15V