An electromechanical generator for converting mechanical vibrational energy into electrical energy, the electromechanical generator comprising: a central mast, an electrically conductive coil assembly fixedly mounted to the mast, the coil assembly at least partly surrounding the mast, a mount for the coil assembly extending radially inwardly of the coil assembly and fixing the coil assembly to the mast, a magnetic core assembly movably mounted to the mast for linear vibrational motion along an axis (A-A) about an equilibrium position on the axis, the magnetic core assembly at least partly surrounding the coil assembly and the mast, a biasing device mounted between the mast and the magnetic core assembly to bias the magnetic core assembly in opposed directions along the axis towards the equilibrium position, the biasing device comprising a pair of first and second plate springs (102, 104), each of the first and second plate springs having an inner edge (106, 108) respectively fitted to first and second opposite ends (6, 8) of the mast and an outer edge (114, 116) fitted to the magnetic core assembly, the outer edge of the first plate spring being fitted to a first end part of the magnetic core assembly and the outer edge of the second plate spring being fitted to a second end part of the magnetic core assembly, and characterized by a resilient device mounted between the biasing device and the magnetic core assembly, the resilient device being configured to be deformed between the biasing device and the magnetic core assembly when the magnetic core assembly has moved, by the linear vibrational motion, away from the equilibrium position by a predetermined non-zero threshold amplitude, the resilient device comprising a pair of first and second flat spring elements (188, 190), each of the first and second flat spring elements having an outer edge (192, 194) fitted to the magnetic core assembly and a free inner edge (196, 198) spaced radially outwardly from the mast and spaced axially inwardly of the respective first and second plate spring. a central mast, an electrically conductive coil assembly fixedly mounted to the mast, the coil assembly at least partly surrounding the mast, a mount for the coil assembly extending radially inwardly of the coil assembly and fixing the coil assembly to the mast, a magnetic core assembly movably mounted to the mast for linear vibrational motion along an axis (A-A) about an equilibrium position on the axis, the magnetic core assembly at least partly surrounding the coil assembly and the mast, a biasing device mounted between the mast and the magnetic core assembly to bias the magnetic core assembly in opposed directions along the axis towards the equilibrium position, the biasing device comprising a pair of first and second plate springs (102, 104), each of the first and second plate springs having an inner edge (106, 108) respectively fitted to first and second opposite ends (6, 8) of the mast and an outer edge (114, 116) fitted to the magnetic core assembly, the outer edge of the first plate spring being fitted to a first end part of the magnetic core assembly and the outer edge of the second plate spring being fitted to a second end part of the magnetic core assembly, and characterized by a resilient device mounted between the biasing device and the magnetic core assembly, the resilient device being configured to be deformed between the biasing device and the magnetic core assembly when the magnetic core assembly has moved, by the linear vibrational motion, away from the equilibrium position by a predetermined non-zero threshold amplitude, the resilient device comprising a pair of first and second flat spring elements (188, 190), each of the first and second flat spring elements having an outer edge (192, 194) fitted to the magnetic core assembly and a free inner edge (196, 198) spaced radially outwardly from the mast and spaced axially inwardly of the respective first and second plate spring.