I have watched several youtube videos on how transistors work but all the explanations use a classic resin coated transistor with three prongs you can solder to you project . What I just can’t seem to grasp is how the that can be translated to a solid silicon disk.
Physically, how are the three layers separated (npn/pnp); and more importantly, how do you wire up a billion of them?
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The doping layers aren’t physically separated. You wire them all up with many different layers of copper. If you want to really understand all this you’re gonna need to do your own research because it’s not a simple answer. I have a degree in this stuff and still couldn’t explain half of it very well. Manufacting semiconductors is arguably the most technically difficult thing humans have ever accomplished. It’s VERY VERY complex abd difficult to fully understand.
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