Multi-layer printed circuit boards have trace layers inside the board. This is achieved by laminating a stack of materials in a press by applying pressure and heat for a period of time. This results in an inseparable one piece product. For example, a four-layer PCB can be fabricated by starting from a two-sided copper-clad laminate, etch the circuitry on both sides, then laminate to the top and bottom pre-preg and copper foil. It is then drilled, plated, and etched again to get traces on top and bottom layers. COUNT 4
QSN1 If you started with a two-sided laminate etched on either side, laminated to the top and bottom, and processed it again to get traces on the outside layers, how many layers would your final PCB have? ANS1 four QSN2 What makes up the inside of a multi-layer PCB? ANS2 trace layers QSN3 Pressure is one thing you need to apply to make a multi-layer PCB; what's the other thing? ANS3 heat QSN4 What tool is used to push the trace layers in a multi-layer PCB together? ANS4 press