A circuit diagram depicts how electronic components are connected to create the desired product. Every component on the circuit board diagram is represented by a circuit symbol. Printed circuit board schematics are getting increasingly prevalent these days. These boards are comprised of insulating and extremely heat-resistant materials like fiberglass. They are constructed from a single to many layers. Let's take a closer look at the circuit board schematic. Creating a circuit diagram in EdrawMax Online is very simple. The free circuit diagram builder has various features, including the ability to easily import data from a.csv file or to create one from scratch using free templates.