prevent solder shorts, the coating is called a solder mask. Soldermask is generally green in color but can have different colors: green, red, blue, white, black. Only the outer layers need to be covered with solder mask, the inner copper circuit imprimat layers are protected by the
for multilayer printed circuit boards with more than two, four and circuit imprimat especially more than six layers of copper has been concurrent with the adoption of surface mount technology. "Through holes" components are assembled by their legs passing through the board and glued to the pads on the other side. "SMD" components are soldered on
the route or the higher the frequency, the better adaptation is required. When producing the imprimat circuit printed circuit with controlled impedance, the impedance will be controlled by acting on the dimensions of the tracks and the distance between them, i.e. the insulation. For a multilayer printed