usually printed with a non-conductive permanent epoxy ink. The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that can help users during assembly. It is used imprimat cablaj circuit to mark component values, part numbers, test points, polarity, etc.
both methods imprimat cablaj circuit for soldering components. Today PCBs with components mounted only through holes are now less common. Surface mount is used for components like transistors, diodes, IC chips, resistors and capacitors. Through-hole mounting can be used for some large components such as electrolytic capacitors and connectors.
the outer layers need to be covered with solder mask, the 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 cablaj imprimat circuit layer similar to varnish on the entire surface of the printed circuit less