Abstract: The present invention is directed to a power bank with the capability to harvest electric energy which is then configured to charge its onboard battery such that the power bank is self-recharging. The energy harvesting power bank has an internal area provided with a piezoelectric mass suspended within a suspension frame by resilient members. The internal area is lined with piezoelectric film that is impacted by the piezoelectric mass as a result of the kinetic energy derived from movement of the power bank. As a consequence, the piezoelectric materials will generate electrical energy which will undergo conditioning by energy harvester electronics. The conditioned electrical energy is used to provide power to the USB charging port for use in recharging portable devices.

Abstract: The present invention is directed to a power bank with the capability to harvest electric energy which is then configured to charge its onboard battery such that the power bank is self-recharging. The energy harvesting power bank has an internal area provided with a piezoelectric mass suspended within a suspension frame by resilient members. The internal area is lined with piezoelectric film that is impacted by the piezoelectric mass as a result of the kinetic energy derived from movement of the power bank. As a consequence, the piezoelectric materials will generate electrical energy which will undergo conditioning by energy harvester electronics. The conditioned electrical energy is used to provide power to the USB charging port for use in recharging portable devices.

Abstract: The present invention is directed to an acoustic resonator within an acoustic chamber such as a stringed instrument body. The acoustic resonator is provided with a piezoelectric material. The kinetic energy derived from the acoustic chamber creates vibrations of sound producing a corresponding or sympathetic mechanical vibration to the piezoelectric material. As a consequence, the piezoelectric material will generate electrical energy which will undergo conditioning by energy harvester electronics. The conditioned electrical energy is used to provide power to multiple devices including on-board electronics or a USB charging port.

Abstract: The present invention provides an acoustic resonator coupling for securing a tuning fork within a stringed instrument body. The acoustic resonator coupling incorporates the use of retractable prong members to imbed the coupling to the wood of the instrument body. The prong members penetrate the wood leaving only a very small prick mark that does not mar the material of the instrument body thus retaining the value and aesthetics of the stringed instrument. Provisions are provided on the acoustic resonator coupling permitting for the releasable mounting of the tuning fork.