I am trying to understand computers from the building blocks up. I know computers use transistors to amplify voltages, and this is used for arithmetic, such as a MOSFET.
However, what really makes up a typical computer bit? Is it just two input currents, one higher and one lower? Two possible states? Is movement a bit (run or walk)?
How can I make a bit? Do I just need an emitter, current, and multiple passages?
Would I have a bit if it couldn't be amplified (i.e. a two-series circuit with no amplification of current)?