ROTARY CIRCUIT CONTROL DEVICES WITH CHANGEABLE GRAPHICS

摘要

An electrical circuit control of the type having a knob (12) which is turned by an operator to vary a circuit condition is affixed to the face of an electronic image display device (16) and at least a portion of the knob overlays the image display area (14). This enables display of instantly changeable calibration marks and/or other graphics (13, 18) in close proximity to the circuit control including at locations immediately adjacent to the perimeter of the knob (12). Electronic components of the control are contained within the knob and a base member (31) at the front of the panel. Components of this kind may be embedded in or attached to the knob itself enabling easy repair by simply replaced carrier that fits within the base (31). A signal processor can convert initial values of the control signal produced at successive settings of a control to differing assigned values.