Energy generation- Unconventional energy harvesting ways part 2

An in depth description of an electret, meant to be comprehensive for everyone as much as possible.

Attached to this description you will find a document which is a compilation of forum posts, that condenses all the precious information that otherwise would be scattered all across the internet,which enables the reader to build his own version of electret.

https://mega.nz/#F!KtwB3TrR!G2j0VAUtEI2Hbc9FAu7QIg