Computers start with Silicon:
Over 90% of the Earth's crust is composed of silicate minerals, making silicon the second most abundant element in the Earth's crust (about 28% by mass) after oxygen.
Has 4 electrons free to bond with other atoms:
Si all on its own:
Silicon can be alloyed with Boron and Phosphorus atoms to create positive or negatively charged material:
Diode:
Put "P" and "N" material together → create depletion zone along border↓
Supply electrons to n side →create smaller depletion zone allowing electrons to cross through P side↓
Supply electrons to P side→ increase size of depletion zone, makes it impossible for current to pass through ↓
Diode = one way gate
What happens if you put two diodes together? N-P-N?
↑You end up with two depletion zones↑
If you try to pass a current through it?
A large depletion zone will build up on one side or another that does not allow the current to flow.
Change where you hook up the battery:
Just acts like a diode - current flows, and no large depletion zones are created: ↓
Add a second LARGER voltage source - electrons can pass through the entire NPN junction, most electrons will be sucked towards the larger potential, so the small signal coming into the center has been amplified.
Nothing applied to the center = no flow of electrons:
Small voltage applied to center = small voltage is amplified
Emitter - emits electrons
Base - opens path if a potential is applied
Collector - + side of NPN junction
Use this as a switch
"Emitter Follower" gate
Boolean Logic/Algebra
value of the variables = true & false, or 1 and 0 respectively.
Think about how you could add transistors together to create:
83KB document = 83*1024 = 84,992 bytes
8bytes/letter
84992/8=10,624 letters (not counting formatting information etc.)
