In this paper, we proposed an idea for conversion of sound into electrical energy and there by using it for various applications. The piezoelectric transducer is used here for conversion of sound into electrical energy. The basic principle behind this is piezoelectric effect. When an electrical energy applied across piezoelectric crystal it starts vibrates. Similarly when a vibration created due to sound or mechanical energy applied across piezoelectric crystal, Piezoelectricity is generated. Here, four piezoelectric transducer is connected with sound sensor to produce a output voltage in the range of 3-5Volt. The output voltage is boosted by using booster converter. The voltage is then stored in rechargeable battery and used for application like traffic signal controller. The PIC micro controller is used to provide the operating criteria and time delay for traffic signal controller and relay is used for stating purpose of application