Complete Steps for PCB Design
When you take out a PCB from any electronic device you will see a green shiny board that has multiple chips and other electronic components mounted over it. For many who are not very well aware of PCB designing, they might think that a circuit was drawn as per the requirement and then components were mounted onto the printed circuit board to the final PCB is good to be installed. This might be the perception of many people, but in reality it is way far from the PCB design methodology. Form the very first step to the last testing and implementation step every precaution has to be taken in order to get the desired current and voltage ratio at the input and output of the circuit. For complex designs like that used in computers, cell phones and human robots a difference of even 1mA of current, that is 0.001A, can also largely deviate the obtained output from the desired output. Following are the steps that are involved in the process of PCB designing.
The first step is by designing the circuit by hands and referring to a guide book or tutor to ensure that all possible components are used in the circuit and are connected with the correct logic. Misconnection can lead towards malfunctioning of the circuit or can even short circuit the entire circuitry.
It is recommended that once the manual design is completed it is first tested with any computer software tool to be 100% sure about the input-output and point to point voltage and current rating of the circuit. Eagle and Multi-Sim are the common software available for circuit testing and standardizing design parameters and components value. In complex designs, every care is put to make sure that not only the input and output ratings are desired, but current, voltage, resistance and power rating at each node or point in the circuit is similar to the desired reading.
Bread Board Layout
When a new circuit is been implemented then it is not directly implemented on the printed circuit board but on the bread board. Component ratings and current carrying capability can change in the real time and therefore the result from the software tool can vary when applied practically. For this reason it is better to first implement it on the bread board where components are not mounted or soldered and they can be replaced any time as required.
When the circuit has been tested on the bread board now the design is ready to be implemented on the printed circuit board applying all changes in the circuit or components done in previous steps. The circuit is first pasted onto the board followed by drilling, component placing and soldering to prepare the finished PCB design.
After completing all process last step is pcb assembly and there testing.