As for the production of multi-layer circuit board, the first step is to draw the schematic diagram of the circuit according to the functions needed to be realized by electronic products. There are special drawing tools, just like understanding each component with wires.

Then, the PCB circuit board design software will generate physical connection files according to the circuit schematic diagram, and connect all the components together. The connection places in the actual production are very thin copper skin, which can conduct electricity.

Such a PCB circuit board is done, and then send the completed file to the specialized multilayer circuit board manufacturers for production, it is made into the actual circuit board.

But a multilayer circuit board made from a circuit board manufacturer has no components; it is just a few connections.It's like an electrician wiring a wire, leaving out all the electrical positions that need to be connected and connecting all the wires.The last thing we need to do is just install these components.

We need to use the components, soldering to the specified location, then the whole multilayer circuit board will form the actual working circuit, you can achieve the desired function.