Abstract: A printed wiring circuit board construction comprising a flexible tape (10) having printed wiring (13) affixed to a surface thereof, which tape (10) is stretched over an open rectangular frame (11). The tape (10) is folded downward over the side-walls (16) of the frame (11) and then up within the frame and there secured by spring clamps (18, 26, 27) fitted over the edges of the side-walls (16) of the frame. Electrical components (19) are mounted on the tape (10) within the frame (11) for maximum protection. Featured is an integral connector arrangement at one end of the structure by which back-plane terminal pins (30) may be admitted into a slot (21) in a frame side-wall (15') in order to make contact with the printed wiring terminations (29) on a tape portion extending within the slot (21).