will be controlled by acting on the dimensions of the tracks and the distance between them, i.e. the insulation. For a multilayer printed circuite imprimate confectionare circuit with a specific stack-up, it must be taken into account that the internal tracks with controlled impedance are shielded by copper planes and for
are plated before the layers are laminated together. FR-4 epoxy glass is the most common insulating substrate. Flexible-Rigid printed circuits are boards that bring in a confectionare imprimate circuite unique combination of superior technology a flexible printed circuit made of a thin polyamide of 0.1-0.3 mm with a rigid printed circuit on an FR4 substrate. These printed circuits
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 layers are protected by the adjacent substrate circuite confectionare imprimate layers. The soldering mask soldermask is made of