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PCB & PCBA Keypads & Keyboards are types of software that are used in the electronics industry. PCB (Printed Circuit Boards) mechanically supports and connects electronic or electric components using conductive tracts, pads and other features that are etched from one or more layers of copper laminated onto or between sheet layers of a non-conductive substrate. PCBA (Printed Circuit Board Assembly) is the board after all printing solder paste onto the PCB then mounting components such as resistors, integrated circuits and capacitors upon the board.