The PCB as a whole? Usually fiberglass or some other substrate to which sheets of copper are fastened. Then wherever you don’t want a copper trace is removed by acid. Then the board is covered by something that acts as a protective layer to prevent oxidation.
But what is it, aluminum?
The PCB as a whole? Usually fiberglass or some other substrate to which sheets of copper are fastened. Then wherever you don’t want a copper trace is removed by acid. Then the board is covered by something that acts as a protective layer to prevent oxidation.
Here’s a video detailing the process for those interested 😀
https://youtu.be/YJr-kHy6STg?si=CugU2ezd6KZI5wDA