An apparatus for converting vibratory mechanical energy into electrical energy includes a mobile mass, a support, first and second beams, the second being piezoelectric, and a junction element. A current limiter limits an output current of the voltage current converter to a specified current value or less. Set screws are threadably received in the lips on diametrically opposite sides of the holding screws to adjust the upper surface of the kerf insert portion to be planar with the upper surface of the table insert portion. The correction of position is performed based on the parallax offset value.