In a feedback control mechanism for active damping of slider air bearing
vibrations in a hard disk drive slider, an assembly is used to acquire a
velocity signal from the slider. A filter, electrically coupled with the
assembly, is used to filter a velocity signal to achieve a vibration
signal. A phase-shifter, electrically coupled with the filter, shifts the
phase of the vibration signal to achieve a phase-shifted vibration
signal. An amplifier, electrically coupled with the phase-shifter,
adjusts the amplitude of the phase-shifted vibration signal to achieve an
amplitude adjusted vibration signal. An electrical coupler couples the
amplitude adjusted vibration signal with the slider for actively damping
air bearing vibrations in the slider.