The printed circuit board, which is also called as the printed wiring board or printed wiring card, is piece of electronic equipment, which physically connects two or more electronic components together to make it work. It is a part of an electronic device and is the one responsible in creating a circuit in order for the device to work. A printed circuit board assembly (PCB assembly) is usually found in computers or laptops, in the form of the motherboard.
A PCB assembly can also be found in other electronic devices like a television, calculator, tablet, mobile phone, and even on an electronic wristwatch. The printed circuit board is used around the globe in assembling different electronic devices. It makes the electronic devices easier to manage.
If the printed circuit board was not created, all the electronic components inside an electronic device will need to be secured together using a lot of cables to connect one electronic component to another electronic component. Before the development of printed circuit boards, old electronic devices such as the old computers with vacuum tubes used this kind of set-up.
Although it worked for most devices, the wires used, as the times goes by, experienced wear and tear, which directly affects the efficiency of the computer. Thanks to the development and production of printed circuit boards – the sizes of the computers reduced, like the ones most people are using today.
Steps in Making a PCB Assembly
In designing a printed circuit board, the designer or engineer would first select the materials to be used with it. The substrate or the base material is where the circuit is etched or engraved. The fibreglass is the most common material used for substrates. It is important to make sure that the board is made of an insulated substance. Once the design is finalized and the material to be used for the substrate is selected, the places where the components will go will be then punctured and prepared for the next steps.
Choosing the conductive material for the circuit is the next step. Copper is one of the most common materials used for circuit boards. Once the design is set on the board, then, the copper is etched onto it, connecting the holes that were created on the board. Each line created on the circuit board is carefully designed in order to make sure that the electronic components will meet in the circuit.
Most printed circuit boards have patterns on both the top and bottom part of the board. However, for cheaper priced ones, the design is usually printed at the bottom part only. Most printed circuit boards are commonly coloured as green. However, there are also some cases when they are coloured red. These colours are the solder mark of the printed circuit board.
This solder mark protects the patterns that are printed onto the circuit board. It also protects the patterns from getting scratched or from touching each other, which may cause interruptions on the circuit board’s electronic circuits.
There are also some situations when solder jump exists:
It is when the copper paths on the circuit board are shorted because two circuit paths (that should not go together) are placed together. The solder mark also prevents this solder jump from happening. The silkscreen layer makes the placing of electronic components easier.
Once all the electronic components are placed on the printed circuit board, a silkscreen layer will be placed. The silkscreen layer makes it easier to spot which component must be placed on a certain part of the board. These marks and codes are usually white in colour to make it easier for users to identify the green solder mark of the PCB assembly.
|Printed Circuit Board assembly is globally demanded especially by modern device companies, various machines and services.|