PCB

A printed circuit board (PCB) mechanically sustains and electrically connects electronic parts working conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductive substrate.  PCB can be worked by single sided (one copper layer), double sided (two copper layers) or multi-layer. Connected with plated-through holes is called vias that carry the electricity on different layers.  Advanced PCB may include components, such as led, metal-dome, inductors, capacitors, Sensor, resistors or active devices - embedded in the substrate.