PCB Assembly For Main Board consists of several layers, and each one plays a significant role in the functionality of the final PCB. These alternating layers include:
• Substrate: This is the base material of a PCB. It gives the PCB its rigidity.
• Copper: A thin layer of conductive copper foil is added to each functional side of the PCB — on one side if it's a single-sided PCB, and on both sides if it's a double-sided PCB. This is the layer of copper traces.
• Solder mask: On top of the copper layer is the solder mask, which gives each PCB its characteristic green color. It insulates copper traces from unintentionally contacting other conductive materials, which could result in a short. Holes in the solder mask are where solder is applied to attach components to the board.
• Silkscreen: A white silkscreen is the final layer on a PCB board. This layer adds labels to the PCB in the form of characters and symbols. This helps indicate the function of each component on the board.
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