Abstract: A mechanical vibrator or tapper is shown in which a high intensity permanent magnet armature moves within the field of a coil of wire wound about the magnet. The magnet is guided for reciprocal motion within a spool containing the winding and strikes impact pads at opposite ends of the central spool opening. The magnet consists of two permanent magnets bonded to one another with like poles facing one another and is freely movable within the spool opening and is guided therein. A permanent magnet is fixed at one end of the spool opening and forces the permanent magnet assembly to reverse its motion after the magnet field of the winding drives the armature magnet against the impact pad at that end of the spool opening, and the magnetic field of the coil goes to zero. An oscillator circuit for driving the system is contained on printed circuit boards mounted within the housing which encloses the vibrator structure. The housing is crimped together in its final assembly.