In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. A first frequency depends on the secondary leakage inductance of an output transformer and capacitor. Extension of the diaphragm can be reduced by having two diaphragms, , each providing half the flush volume by their extension. The storage unit stores a control program. The system also allows standard CAD drawings to be imported into the alarm CAD system.