The copper foil is covered throughout the circuit board and is partly etched off during the manufacturing process. The surface can be seen very small line data is copper foil. What’s left is a network of tiny wires called wires, or wiring, that provide the electrical connections for the parts on the circuit board. Usually the color of the circuit board is brown or green, which is the color of the resistance paint. A protective layer of insulation that maintains copper wire and prevents parts from being soldered to the wrong place.
The circuit board is very horizontal and can add wiring area. Multilayer boards used more single or double-sided wiring boards, and now video CARDS and motherboards are multilayer boards. An insulating layer is placed between each layer and pressed together. The number of layers on a circuit board represents several separate wiring layers, usually an even number and including the outermost two layers. Rare boards are usually 48 layers in layout. The number of layers on many boards can be seen by looking at the cut side of the board. But in fact, no one has such good eyesight. So, here’s another way to do it.
The main board and display card mostly use 4 – layer circuit board multi – layer board circuit connection is through buried hole and blind hole technology. Some are 68 – or even 10 – layer circuit boards. Want to see is the circuit board how many layers, through the investigation of the guide hole can be identified, because the main board and display card on the use of the 4 layers of the board is the first 4 layers of wire, the other several layers of other USES (ground and power) so, like the double board, the guide hole will be punched through the circuit board. If some of the guide holes appear on the front of the circuit board, but can’t be found in the gap, then it must be 6/8 laminates. If the positive and negative sides of the circuit board can find the same guide holes, it is 4 laminates.