Printed circuit board
![Part of a 1983 Sinclair ZX Spectrum computer board; a populated PCB, showing the conductive traces, vias (the through-hole paths to the other surface), and some mounted electronic components](/Images/godic/202502/01/PCB_Spectrum4121.jpg")
![A board designed in 1967; the sweeping curves in the traces are evidence of freehand design using adhesive tape](/Images/godic/202502/01/S111FlipChipBack4121.jpg")
![The two processing methods used to produce a double-sided PWB with plated through holes](/Images/godic/202502/01/Double_side_PCB_process_flow_chart4121.png")
![PCB copper electroplating line in the process of pattern plating copperPCBs in process of having copper pattern plated (note the blue dry film resist)](/Images/godic/202502/01/PCB_copper_layer_electroplating_machine4121.jpg")
A printed circuit board (PCB) mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductive substrate. Components — capacitors, resistors or active devices — are generally soldered on the PCB. Advanced PCBs may contain components embedded in the substrate.