A voltage regulator including a first, second, and third capacitances, first switches, and second switches. A shaft is disposed on the table and has an axis. The conductive material is electrically connected to a low voltage power source and has a contact surface connectable to a low voltage device. Measuring an initial vibration may include using conditioning electronics in connection with the accelerometer. De-identifying includes the creation of a first encoded patient identifier responsive to the first patient identifier.