Eli5: how do circuit board works
In: 2
I think the most interesting thing about circuit boards is that they’re “printed” circuit boards. The pattern that will eventually be etched into the copper foil is created using a light-sensitive film. [This video shows it step-by-step](https://www.youtube.com/watch?v=7wAer7a3tU4)
Complex electronics have many layers. They print and etch a layer, glue on another layer of fiberglass, copper, and photoresist, and print the next trace layer. The final layers of solder-mask and symbols or letters are [silk-screen printed](https://www.youtube.com/watch?v=MDDE8VvViFo) – almost exactly like t-shirts.
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