A device and method for disclosing position of a positionable input by positioning the input over a range of positions to cause the magnitude of the directional component of a vector representing a field or force produced by a source to change from a reference magnitude or reference direction as the input is being positioned while an electric circuit that contains a sensor for sensing the directional component is changing the value of an electric signal for restoring the magnitude of the directional component being sensed by the sensor to the reference magnitude or reference direction, and using the value of the electric signal to disclose the position of the input.