one of the first aids that allowed this modernization. The smaller and smaller dimensions and the flexibility of the printed circuit board made in recent years have pcb greatly helped fields such as medicine and aeronautics to benefit from smaller and lighter equipment that has allowed them a high degree of
inner copper layers are protected by the adjacent substrate layers. The soldering mask soldermask is made of a fluid substance like an ink and is applied in a thin layer similar to pcb varnish on the entire surface of the printed circuit less on the soldering pads and it also has a
called multilayer. PCBs can be single-sided (one layer of copper), double-sided (two layers of copper on both sides of an insulating board), or multi-layered (outer and inner layers of copper alternating with insulating layers). Among the multi-layer PCBs, the most common are pcb the four-layer ones. The four-layer board has many more routing options in the