A gas generating system comprises an air separation module in fluid communication with a nitrogen enriched air line and an oxygen enriched air line. By estimating a direction of polarization of the fast shear mode at low and high frequencies and comparing the estimated distances, a cause of anisotropy is established. The second operational mode utilizes a lower bandwidth control loop to ensure stable operation of the control loop during normal operation of the power amplifier. The input device can sense movement both in the X-Y motion of the ball, and the spin of the ball. The capacitor divider circuit generates a low voltage alternate current signal that can be converted to a corresponding low voltage direct current signal by employing a rectifier circuit. The workpiece platform is accordingly loaded into the device from one side and unloaded from the other side of the device.