When PCB size is too large, the printed line is long, the impedance increases, the anti-noise ability decreases, and the cost increases. Too small, the heat dissipation is not good, and the adjacent lines are susceptible to interference.
PCB as the support body of electronic components, its surface needs to be welded components, it requires a part of the copper layer exposed for welding. Hence the need to brush solder resistance paint.
When the copper wire on PCB board is soaked in etching liquid for a long time, it will cause some fine line backing zinc layer to be completely reacted off and separated from the substrate, that is, the copper wire falls off.
Whether gold or silver, the purpose of the process itself is to prevent oxidation, protect the pad, so that it in the subsequent welding process to ensure yield.
The quality of PCB directly affects the quality of the whole electronic products, PCB testing is a timely detection of problems, but also a necessary means to prevent more defective products to reduce losses.
In order to obtain the best performance of electronic circuits, the layout of components and wires are very important, and wiring as the top priority of PCB design process, which will directly affect the performance of PCB board.
The OSP acts as a barrier between the copper and the air. Simply put, it chemically grows an organic film on a clean, bare copper surface. The only function of this organic film is to ensure that the inner copper foil does not oxidize before welding.
Field observation is a practical investigation method, which is of great reference significance for the internal self-understanding and improvement of PCB manufacturers, as well as the understanding and selection of suppliers.
There are three main types of metal substrate: aluminum substrate, copper substrate, iron substrate. Iron substrate is rarely used in the market, here the focus of analysis is aluminum substrate, copper substrate.
In PCB design, wiring is an important step to complete the product design, it can be said that the previous preparatory work is done for it, in the whole PCB, the wiring design process to limit the highest, the most fine skills, the largest workload.
The role of PCB board is not only to combine scattered components, but also to ensure the regularity of circuit design, a good way to avoid the chaos and error caused by manual wiring and wiring.
Industrial circuit boards should pay attention to heat dissipation problems; The second is printed board copper foil line, poor quality circuit board power supply line copper foil is very thin, easy to burn due to the current.
