Monday, August 15, 2016
The Basic Knowledge of Printed Circuit Board that We Need to Know
In our life, we can see PCB find PCB everywhere, the telephone, computer, car, radio, etc; it is a used in many electronics products. PCB looks like just a simple board, but it is a necessary part in most of the electronics products. Putting a simple PCB can make the smart phones smarter and slimmer. Comparing the machine, it has small body and takes small space in the machine; it allows the mounting of other electronic components directly on to it. So, what is PCB? Today, we are going to get some basic knowledge of PCB.
The full name of PCB is Printed Circuit Board. It has different layers, from single layer to multilayer. Printed circuit board is a non conducted board, such as plastic and glass on to it which the pattern is printed by conducting metal such as copper. This allows the current to pass only through the conducting pattern at the required rate, which is controlled by using resistors, transistors and amplifiers.
For creating a PCB, we need finish four main steps, which is designing, printing, etching and completing the board. Now, we will have a simple introduction of these four steps one by one.
Designing is the very beginning of one PCB created. For designing a PCB, we must use designing software. This step is the most important part and the function of a device is depended by how the circuit designed. But please note that if you design the circuit faultily, all of work at creating of the board might be wasted. So, the engineer must be very careful. Once the design finished, we will get a Gerber file and it will be used to build the board.
After finishing the design, we can go on and enter into printing process. This is the stage where the circuit design is stenciled on copper covered circuit board. The pattern of the circuit is created by using non corrosive ink, so that only the pattern of the circuit will be remained when the board is immersed in etching process.
Now, we are at the third stage where the board is immersed in an etching process that is a mixture of hydrogen peroxide and muriatic acid. The etching dissolves or melts away the unprotected copper coating and only the circuit design which was covered with noncorrosive ink remained. The printing which consists of lines of copper that remained on the board, this is called trances. The circuit board is finally washed in neutralizing bath or cold water to remove any traces of the remaining etching.
Finally, the board goes into the drilling step. Drilling holes, where the components will be attached. Once this step is finished, the PCB is ready to be used.
This is just a simple explanation of the production process of the printed circuit board. Every factory has their different manufacturing process. We still need to work hard to get deeper knowledge of PCB.