Careful friends can find that most common printed circuit boards are green. Why is this? The financial statements of printed circuit board assembly should be prepared in this way. The advantage of green oil board is its compact size, which is relatively cheap.
What is a suitable fixed length and width? During production, some PCB boards are mostly single and double sided, so the difference between PCB boards and FR4 boards is quite significant. Generally, the fixed position for tools is also chosen, so reinforcement bars should be connected in the right place during production.
FR4 board: Whether the thickness is appropriate is due to the difference in dielectric constant and thickness of the material. An engineering component must be controlled within a certain range, and fourth, it is still relatively thick. This effect is not very good,

FR4 board: generally, it is a four layer board, that is, the top layer of copper foil. Generally, six layers of copper foil are finished products. Generally, there are countless military products used. Generally, the design of circuit board is based on the means of production, components, and connection layout to determine the thickness of copper foil on the surface. Generally, it is well designed.
Unlike surface adhesion, the following article will elaborate on the differences between two-layer and 6-layer boards. We can distinguish them from two perspectives: one is based on the depth of the holes and the thickness of the board surface, and the other is based on the hole side on one side, which produces a hole with a core on one side, and the bottom hole side on both sides.
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