A vibrator apparatus includes a moving coil, which is rigidly attached to a member, e.g. a frame or beam, of a vibration device. The moving coil is for an elected vibration mode of the apparatus configured to receiving electric signals, e.g. pulsating and/or sinusoidal electric signals, from a signal unit. The moving coil co-operates with a permanent magnet, which is suspended by springs attached to the member, and the coil and the magnet are mutually linearly and coaxially movable upon application of electric signals to the moving coil. An actual distance of movement being part of a distance between extreme positions and being less than the axial length of the moving coil. The springs are located at a distance from a respective axial end portion of the permanent magnet.
