Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.