The first is a single panel, in the most basic PCB, the parts focus on one side, the lead is concentrated on the other side. Because the wire only occurs on one side, the PCB is called a single sided circuit board. Single panels are usually made of simple, low cost, but the disadvantage is that it can not be applied to too complex products.
Double panel is an extension of the single panel, when the single wiring can not meet the needs of electronic products, it is necessary to use double-sided board. Both sides have to cover the copper wire, and can through the hole to guide the line between the two layers, so that the formation of the required network connection.
The multilayer board is a printed board which has three layers of conductive graphics layer and the insulation material which is separated by the lamination, and the conductive pattern is printed on the request. Multilayer circuit board of electronic information technology to the product of the high speed, multi function, large capacity, small volume, thin, lightweight direction.