Properties of the printed circuit board
and power return. For microwave printed circuits, transmission lines can circuit printed board base Aluminum be laid out in a planar form, such as stripline or microstrip, with dimensions carefully controlled to ensure consistent impedance. In RF and fast switching circuits, the inductance and capacitance of the printed circuit board conductors become significant, usually unwanted, circuit
Printed circuit board assembly
assembled by their legs passing through the board and glued to the pads on the other side. "SMD" components are soldered on the same side of the board. A board can use both methods for soldering components. Today PCBs with components mounted only through holes are now base printed board circuit Aluminum less common. Surface mount is
Printed circuit soldermask
from corrosion and reduces the chances of solder shorting between traces or unwanted electrical contact with possible loose wires. For its function of helping to prevent solder shorts, the coating is called a solder mask. Soldermask is generally green in color but can have different colors: green, red, blue, Aluminum board base circuit printed white, black. Only the outer layers