New developments in ultralow power electronic devices can now use much solution to energy harvesting systems designed to interface directly with a piezoelectric transducer. However, these environmental energy sources are typically very low power. Recently, a significant number of piezoelectric devices based on lead titanate zirconate (PZTN) have been designed with the purpose of the piezoelectric transducer. At INCDIE ICPECA Bucharest we have realized a piezoelectric transducer for which a PZT+Nb piezoelectric ceramic element was used for low energy source build with piezoelectric circular and linear transducers. Due to their dielectric proprieties and small size, (38 mm × 14 mm × 2 mm), the piezoelectric linear transducers can be optimize the energy harvesting systems applications for which the vibration duration is very short. A multiphysics numerical simulation further illustrates such piezoelectric transducer operation. The energy harvesting system is constituted of five functional blocks which are described in this paper.