Discrete transistor computer

About

I've been working on designing and building a computer using discrete transistor components. This page has information about what I've planned so far, and the parts that I'm planning on building next.

Components

The transistor being used is an N-channel 2N7000 transistor. For this type of transistor, conventional current flows from drain to source.

And the other main component is a 7.5 kΩ resistor

Here's a legend for the diagrams that will come later

Gates

NAND gate

We can make a NAND gate using two transistors and one resistor

XOR gate

An XOR gate can be made from five transistors and two resistors

Larger things

Adder

An adder can be formed by combining three NAND gates and two XOR gates

4-bit Adder

And multiple can be combined by connecting the carry outs to make a 4-bit adder