Twelve printed circuit boards, manufactrured by Union Carbide, with diodes, capacitors, transistors and other electronic components. The boards are possibly spares for an unidentified computer or machine.
A printed circuit board has electronic components that are connected using conductive pathways. Thin copper sheets are bonded onto a support base and then etched to create the conductive pathways between the electronic components. Holes are drilled in the board and the components are soldered into place along the pathways.
All twelve boards are a rectangular shape made of a light brown plastic coated material. One side has silver or gold-coloured metal patterns. The other side has electronic components such as transistors, diodes, resistors and capacitors. Each board has a green connector plug with 35 flat split pins. The boards have a manufacturer name and number on them. Some of the electronic components also have manufacturer names and/or part numbers printed on them. There is handwritten text on some of the boards.
Stamped/printed on boards: " UNION CARBIDE ", " 93823-119 ", " 93823-139 ", " 93823-117 ", " 93823-140 ", " 93823-116 ", "138B", " 93823-119 A ", " 93823-138 " Handwritten on some boards: " OK 1980 ", " AUSTRALIA ", " REASONABLY OK 1980 " Printed on connector: " ELCO 7702 " Printed on component(s): "HELITRIM"
Type of item
118 mm (Width), 95 mm (Depth), 12 mm (Height)
Above dimension is for one circuit board only. Boards have same width and depth dimensions. Height varies according to the size of the electronic components.