1. Dave’s Revision Notes
Higher Technological Studies
Gary Plimer 20005
Applied Electronics (Outcome 3)

2. Applied Electronics (outcome 3)
Gary Plimer 20005
Basic Logic Gates
NOT AND OR
A Z A B Z A B Z
0 1 0 0 0 0 0 0
0 1 0 0 1 1
1 0 1 0 0 1 0 1
1 1 1 1 1 1

3. Applied Electronics (outcome 3)
Gary Plimer 20005
Basic Logic Gates
NAND NOR EOR
A B Z A B Z A B Z
0 0 1 0 0 1 0 0 0
0 1 1 0 1 0 0 1 1
1 0 1 1 0 0 1 0 1
1 1 0 1 1 0 1 1 0

4. Combinational Logic
 It is often necessary to use more than one gate in a logic
circuit. In these cases, we need to analyse a Combinational
Logic circuit.
A B C D Z
0 0 0 0 0
A REMOTE
BUTTON D 0 0 1 0 0
0 1 0 1 0
B Z
TV SET
BUTTON
CHANNEL
SELECT 0 1 1 1 1
1 0 0 1 0
C TV ON/OFF
SWITCH 1 0 1 1 1
1 1 0 1 0
1 1 1 1 1

5. Nand Equivalents 1
Integrated Circuits, (IC’s) come in varying packages.
The one shown below is a Quad, 2 Input, Nand IC.
+Vcc
14 13 12 11 10 9 8
1 2 3 4 5 6 7
Gnd
(0V)
In industry, it is common to restrict the number of IC’s
used. This reduces cost, stock levels and assembly
requirements.

6. Nand Equivalents 2
NOT
OR
AND

7. Converting to Nands
Original
Circuit
NOT = AND =
Substituting
NANDS