traffic in printed circuits, when the tracks carry signals at high frequencies, great care must be taken in designing soldermask the tracks to match the impedance of the upstream and downstream components. The longer the route or the higher the frequency, the better adaptation is required. When producing the printed circuit with controlled
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 to mark component values, part numbers, soldermask test points, polarity, etc. Screen printing does not
components is called a printed circuit assembly, printed circuit board assembly, or PCB assembly (PCBA). In informal usage, the term "printed circuit board" most commonly means "printed circuit assembly" (with components). Components are generally soldered to soldermask the PCB both to connect them electrically and to fix them mechanically. Printed