How to distinguish the circuit board is a single-sided or double-sided or multilayer board?
One sided circuit board, there is no part of the mounting parts (copper foil) circuit, and double-sided circuit board on both sides (copper) circuit. Double sided circuit board, both sides have holes, both sides of the circuit connection; if it is a multilayer circuit board, the circuit board will have many holes, and metal holes on both sides of the line is not connected, and many points, also appeared in the same line, according to the characteristics of it can judge is a multi-layer circuit board such as: motherboard, memory, graphics, etc..
The multilayer board refers to a circuit board which is provided with 3 layers or more than 3 layers to be pressed together, and the double panel is that one side of a plate is provided with a circuit. Carefully observe the multilayer board, there are a lot of small holes, which are actually inside the wire is connected to a few boards on both sides of the board but also less.
The difference between a multilayer board and a double sided board, as well as a single layer board, is the number of faces of a circuit board
