Designers should select the size based on the size of their circuit design. However, it should be noted that various other page sizes are also available. Generally, the tools would select the page size as A4. Most of the design tools offer different page sizes. To achieve a successful design, follow these standard schematic guidelines. Guidelines to draw a PCB schematic diagram Schematics can be an extremely valuable troubleshooting tool during circuit board repair as it traces out the connections in the circuit. It should also be noted that a technically correct but crowded schematic is still a bad one as it might confuse designers. A good schematic shows a well-structured circuit diagram clearly depicting the electrical connections between various electronic components. Schematic is one of the important aspects of electronic circuit design. What is the importance of a schematic diagram?