Please Wait...
Schematic Diagram
A schematic diagram must be made available that shows the connection of the parts on the board. Each part on the schematic should have a reference designator that matches the one shown on the Bill of Materials (BOM). Many schematic layout programs will allow automatic generation of the BOM.
Part List - Bill of Materials (BOM)
The parts to be mounted on the PCB should be detailed on the parts list. Each part should be identified by a unique reference designator and a part description (i.e. a resistor might be shown as reference designator “R1” with a description of “1⁄2 Watt Carbon Film resistor”). Any additional information useful to the assembly process can be included on this list, such as mounting hardware, part spacers, connector shrouds, or any other material not shown in the schematic diagram.
Choose components from Data Sheets
component datasheet example
Part manufacturers provide data sheets to be used by the circuit designer to select parts for the circuit. If we are to be able to design the PCB, these sheets should also have the physical dimensions of the part included. Normally you could find datasheets from manufacturers web sites. If each part type to be used on the board does not have a data sheet, you should procure a sample part you can measure to define this data yourself. This measurment method is far less accurate than using the part manufacturer’s information, especially if there is a large tolerance on the part, but it is better than just guessing. Source "https://technick.net/guides/electronics/pcb/"
