There is a connection diagram in principle , will now be made on-site wiring look. This step is usually automatic , but in general still need to manually change some parts.
Here are the two wire shelves template .
1 red and blue lines represent the element layer PCB with a solder layer .
2 white text with square represents the marked silkscreen .
3 red dots and circles represent drill holes and vias .
4 . The far right can be seen on the solder side of PCB has Goldfinger . The final composition is usually called the working PCB backsheet (Artwork).
Every design , he must satisfy a set of regulations, such as minimum retention gap between the lines , the minimum line width , and other similar practical constraints . These provisions in accordance with the speed of the circuit , the strength of the transmitted signal , the circuit power consumption and noise sensitivity , quality and manufacturing equipment and material factors such as different. If the current intensity rises , and that the thickness of the wire must also be increased.
In order to reduce the cost of the PCB, reducing the number of layers , but also must pay attention to whether these provisions are still in line . If more than two layers of the structure , then the layer is typically used to power and ground planes , to avoid the transmission signal is affected by signal level , and the signal can be used as a shield layer .
