Logic gates are the building blocks of computers, and transistors have made logic gates cheap, light weight, and reliable.The transistors' three metal legs -- the collector, base, and emitter -- control the flow of electrons and determine whether the charge is high or low, and these zeros and ones make our digital words, pictures and sounds.
I'll show you the first logic gate I built. I made it at TechShop
Microprocessors have millions of gates, but some spare change yields a handful of electronics parts, enough to make a logic gate and to see the beauty of computing one bit at a time.
With two transistors you can create your first logic gate, an AND gate. An AND gate responds when both inputs are high or true. If you’re looking for your black cat, Damian, the thing you want must be both a) black and b) a cat.
Is it black? Is it a cat? Could it be Damian?
No No No
No Yes No
Yes No No
Yes Yes Yes
Now let’s go electric!