NOVELTY - Energy from a vibrational energy source is captured by varying a characteristic of an energy capturing rectifier in response to a varying energy characteristic of the vibrational energy source. A transducer is utilized to convert the vibrational energy into electrical energy.    USE - The method is for capturing energy from a vibrational energy source and transferring into energy storage device, e.g. mobile phone battery. The energy source can be a civil structure (e.g. e.g. houses, high-rise buildings and bridges); transport vehicles e.g. motorbikes, cars, trucks, busses, trains and airplanes; wave energy e.g. ocean, rivers and streams; thermoelectric devices; thermo-acoustics (where the vibrations are heat driven); energy storage in a rotating flywheel; hydroelectric systems; broadband or random energy sources, such as noise sources; and vibration turbines, as proposed in the Australian provisional patent specification no. 2006906804. The energy can be transferred from a person walking or running to instruments being carried by the person e.g. a soldier in the field. The energy is also applicable to micro electronic mechanical systems (e.g. medical pressure sensors), nano electrical mechanical systems and any other electrical systems which may be implanted in and powered by a patient's movement; wireless devices e.g. sensors, keyless systems and radio frequency identification devices; solar cells and/or photovoltaics; portable electronic devices e.g. mobile phones, personal digital assistants, digital cameras and portable music players; and laptop computers.    ADVANTAGE - The method makes it possible to increase the efficiency of the energy transfer.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) an apparatus for capturing energy from a vibrational energy source;    (2) computer program arranged to control a computing device; and    (3) a computer readable medium.    DESCRIPTION OF DRAWING(S) - The figure is a block diagram of an apparatus for capturing energy.