Here's a couple of pointers for you:
0. Introduction and general information
This resource will cover what logic gates are, some examples of logic gates and what logic gates can be used for.
That's a good start. But perhaps you should describe what the reader should already understand and the key things they'll get out of it.
Maybe something like:
"I will assume that you have some understanding of electronics and are familiar with what bipolar transistors and mosfets are, but don't know anything about digital electronics. In this resource I will aim to introduce you to some of the elementary logic gates."
Perhaps the next thing you should talk about is what is digital electronics and how it differs from analog electronics. Something like:
"Electronics can be broken down into analog and digital. Analog electronics involves circuits which deal with continuously variable voltages, an example would be an audio amplifier. Digital electronics involves circuits which deal with discrete states. A light switch is an elementary digital device".
After you have laid some groundwork, you can talk about these discrete states:
"Most digital electronics involves binary states, that is any given part of a circuit is in one of two distinct states. These may be called on and off, o and 1, true and false, low and high, etc."
Then we need to know how these are represented.
"In this resource I will normally be using 0 and 1 as the binary states. Typically (but not universally) 0 is represented by a low voltage and 1 by a high voltage."
Then tell us what digital electronics does at its most basic level:
"Digital electronics involves the manipulation of these states to perform what are essentially mathematical functions."
Then you need to tell us what logic gates are:
"The most basic of these mathematical functions are performed by logic gates".
Having laid the ground rules, you can now talk about the gates themselves. Your discussion starts with what they're made of and the packages they come in. I think this is putting the cart before the horse. I really think you should talk about these basic functions first (the abstract notions) before discussing how they are implemented.
So I've moved that part up here:
Yes, I think that talking about truth tables is a good start. Note that in the introductory part I suggest you already cover the various names for binary states, and say you'll be using 0 and 1. How 0 and 1 relate to on, off, high, low, etc. is an implementation issue (or maybe something that you discuss just prior to the implementation of the gates).
Truth tables are used to show the logic of a logic gate, what inputs will produce what output.
It's usually better to explain things in the simplest possible way. How about:
"Truth tables show the relationship between inputs and outputs.
Truth tables are very simple to read, they consist of 2 or 3 columns (some contain more) with a series of 1's and 0's.
Again, to simplify:
"Truth tables contain a column for every input and output. They contain as many rows as there are combinations of inputs."
These ones and zeros represent high and low voltages, there are only two values in truth tables as they work in a binary, digital signal. The digital part means the logic gate can only sense when a voltage is above or below a certain amount. The binary part means it uses base 2, we use base 10, the values can only be a 1 or a 0. The columns on the left (there are usually 2) are the inputs, truth tables will show all the combinations of inputs, for a 2 input logic gate this is:
0(low/off),0(low/off)
0(low/off),1(high/on)
1(high/on),0(low/off)
1(high/on),1(high/on)
This may be complexity that can be avoided. And why not start with the most simple logic gate as an example?
2. NOT gate
A NOT gate is a single input logic gate, it is also known as an inverter. If the input is high the output will be low and vice versa. Below is the truth table for a NOT gate.
"
The truth table below is for the inverter (also called a NOT gate). It has only a single input and a single output. The definition of the inverter is that the output is the opposite state of the input. With only a single input, there are 2 rows because there are only two possible combinations of inputs, a 0 or a 1."
Oh, it's also possible to define tables using bbcode. That will be easier than using images.
3. AND gate
AND gates have 2 inputs, the output will only be high if both inputs high. If any of the inputs are low the out put will be low. AND gates are available with more than 2 inputs, these follow the same rule, needing all the inputs to be high for the output to be high. Below is the truth table for a dual input AND gate.
Yep, I'd go through NOT, AND, OR, then NAND, NOR, and maybe XOR. After that you should point people to boolean logic as a means of symbolically manipulating these logic functions.
Now it's time to talk about implementation issues.
- Relationship between 0 and 1 and high/low, on/off, true/false (careful, it's not as obvious as you may think)
- Voltage levels (and the no-mans land between them (introduce concepts such as the minimum high input voltage and the minimum high output voltage, and why they differ if you're comfortable with that)
- The concept of a "logic family" which is defined as a group of circuits which share the same definitions for logic levels, supply voltages, etc.
- A brief list of logic families, highlighting the ones commonly in use today. (I notice you missed ECL).
In all of these discussions, point to articles on the net that explain the concepts in more detail. Wikipedea is often a good option.
Next you can talk about how you'll find logic circuits.
Remember that they're not always ICs, not always "several transistors", and saying that TTL is popular ignores the fact that LSTTL is far more often used these days. I would tend to list CMOS first.
Be careful of what you're saying because some of it is prehaps misinformed. for example "DO NOT JUST TYPE IN THE LOGIC GATE NAME e.g. AND gate, YOU MUST TYPE IN THE FULL LIST OF LETTERS AND NUMBERS" is misleading. I might want a hex inverter. I don't search for SN74HC04N, I search for 74HC04 because SN is a manufacturer designator and N is packaging information etc. In fact, I might prefer to search for 74*04 because I might be able to use a 74C04, or a 74HC04 (in this case C and HC tell me the logic family)
Logic gates come in the form of integrated circuits, these integrated circuits contain several transistors in different configurations to create logic gates. There are several types of logic gate, each using 1, 2 or sometimes even more inputs to produce an output based on this input.
There are several ways logic gates are constructed, the 2 most popular are called TTL (transistor transistor logic) this uses bipolar transistors to create the logic gate and the other is called CMOS (complementary metal oxide semiconductor) this uses MOSFET (metal oxide semiconductor field effect transistor) transistors, CMOS logic gates are often preferable to TTL's as CMOS generally require less supply voltage to operate. Logic gates need a supply voltage to work, to see where to provide the supply voltage see the datasheet for the logic gate you are using (DO NOT JUST TYPE IN THE LOGIC GATE NAME e.g. AND gate, YOU MUST TYPE IN THE FULL LIST OF LETTERS AND NUMBERS) see the picture below to see what this series of letters and numbers will look like. The picture below is of a CMOS logic 4000 series NOR gate manufactured by Texas instruments, ringed are the characters you will need to type in on a CMOS series logic gate.
Also, use terminology that is well accepted and recognised.
All IC's (integrated circuit) have a little mark called a clocking mark, this is used to find where pins of certain numbers are, pin numbers count counter-clockwise.
I've never heard it called a "clocking mark", and neither has google. The chip has a notch or a circle that is used to identify pin 1.
Also, trim the excessive white space from around your image. Preferably use something clear and simple and appropriately sized. IMHO this image is larger than it needs to be (although perversely they show as very small in these quotes).
MOSFETS (the type of transistor used in CMOS logic gates) are extremely sensitive to ESD (electrostatic discharge), a typical ESD is several thousand volts, far more than enough to fry the thin wafer of semiconductor in the MOSFET. Ensure you do not build up any static and ground yourself (preferably with a anti-static wrist strap)
Whilst this is well intentioned, it is really needs a bit of work. There is no "typical ESD", and ESD will rarely damage the silicon wafer (it will however rupture a thin oxide coating used to insulate the gate of a mosfet).
I hope I haven't depressed you, I think with a little work and some polishing you could have a useful resource here.