PCB design needs to set different points in different stages. In the layout stage, large grid points can be used for device layout.
When I saw the PCB of a computer motherboard, I thought I was able to draw a great thing myself. Later when touched protel99se and entered the drawing board team, followed by Altium, Cadence, and so on. As the experience of the drawing board accumulated, more and more issues were noticed. A good PCB board is not only connected to the line.
The circuit diagram, which is a schematic diagram of the connection of the electronic components drawn by symbols of the circuit components, describes in detail the connection and direction of each component, the description of each pin, and some detection data.
To master several methods of analyzing common circuits, familiarize yourself with the circuit types and analysis steps that are appropriate for each method.