Johnmicheal56 has 1 News online. A PCB populated with electronic
components is called a printed circuit assembly (PCA), printed
circuit board assembly or PCB Assembly (PCBA). In informal use
the term "PCB" is used both for bare and assembled boards, the
context clarifying the meaning. Circuit properties of the PCB
Each trace consists of a flat, narrow part of the copper foil
that remains after etching. The resistance, determined by width
and thickness, of the traces must be sufficiently low for the
current the conductor will carry. Power and ground traces may
need to be wider than signal traces. In a multi-layer board one
entire layer may be mostly solid copper to act as a ground plane
for shielding and power return. For microwave circuits,
transmission lines can be laid out in the form of stripline and
microstrip with carefully controlled dimensions to assure a
consistent impedance. In radio-frequency and fast switching
circuits the inductance and capacitance of the printed circuit
board conductors become si