Controlled impedances of printed circuits
measure the quality of copper tracks. The impedance is an alternating current (AC) characteristic that increases with frequency and becomes critical for printed circuits operating at PCB Assembly frequencies above 200 or 300 Mhz. Impedance calculator software is a good starting point to determine the track width (w) and
Printed circuit soldermask
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, white, black. Only the outer layers need to be Assembly PCB covered with solder mask, the inner copper layers
Types of printed circuit board
is the most common insulating substrate. Flexible-Rigid printed circuits are boards that bring in a unique combination PCB Assembly of superior technology a flexible printed circuit made of a thin polyamide of 0.1-0.3 mm with a rigid printed circuit on an FR4 substrate. These printed circuits are used