After the board surface is oxidized, a fluff layer (copper oxide and cuprous oxide) is formed.

PCB (printed circuit board) is a printed circuit board, which is one of the important components of the electronics industry.

The reason why PCB can be used more and more widely is because it has many unique advantages

Classification according to the number of circuit layers: Divided into single panel, double panel and multilayer board.

To get the best performance from electronic circuits, the layout of components and the layout of wires are important.

Therefore, PCB manufacturers will leave a small point. The length of the left STUB is called B value, which is generally in the range of 50-150UM.