Experiment 2  The AND Gate
The AND gate combines two inputs with the AND logic.
With the AND logic the result Q
can only be equal to 1 if the inputs A AND
B are equal to 1.
This logic is the same logic as in the language usage:
" The house is closed (Q),
if the window (A)
and the door (B) are closed".
 If the window and the door are open (A = 0,B = 0),
the house is open (Q = 0).
 If the window is open (A = 0) and the door is closed (B = 1),
the house is open (Q = 0).
 If the window is closed (A = 1) und the door is open (B = 0),
the house is open (Q = 0).
 If the window and door are closed (A = 1, B = 1),
the house is closed (Q = 1).
This is shown in the truth table...
A 
B 
Q 
0 
0 
0 
0 
1 
0 
1 
0 
0 
1 
1 
1 
Truth Table of the AND logic.

AND symbol in circuit diagrams.

A AND circuit.
(Enlarge)

With one of the four AND gates on the CMOS IC 4081
you can build an AND logic circuit as shown in the picture.
The AND logic is not the only way to logically combine two inputs ...
