LeadSintec

 As we all know, circuit boards are made up of layers of copper foil circuits, and the connections between different circuit layers rely on these "vias". This is because today's circuit board manufacturing uses drilling holes. Connecting between different circuit layers is like connecting channels in multi-layer underground waterways. Friends who have played the "Brother Mary" video game may be aware of the reason that water pipes are connected. The difference is that water pipes are connected Water can circulate (not to be drilled for Brother Mary), and the purpose of circuit board connection is to conduct electricity for electrical characteristics, so it is called a via hole, but if it is just a hole drilled by a drill or a laser, it is It does not conduct electricity, so a layer of conductive material (usually "copper") must be plated on the surface of the drilled hole, so that electrons can move between different copper foil layers, because the sur