Laboratory Manual - King Fahd University of Petroleum and Minerals

R 3
C 4
+15V
C 6
C 3
2
7
+15V
-
R 4
2
7
+15V
R
741
-
5
+ 6
2
7
741
-
3
4
+ 6
R
741
1
-15V
3
4
+ 6
Square
-15V Triangle 3
wave
4
wave
output -15V
output
Sin wave
R 2
output
R 6
V out
Astable multivibrator Integrator Low-pass filter
Figure 4: A simple circuit to generate triangle and sin waves from square wave.
Generating other wave forms from sine wave:
You may also start with a sin wave signal and generate the other two waves. Using a
comparator after the sin wave will produce a square wave output. Then use an integrator
to change the square wave to triangle wave as shown in Figure 5.
2
+15V
7
-
741
+
R 1
R 2 6
3
4 R 3
-15V
C 1
Sin wave
output
Comparator
2
3
+15V
7
-
741
+
4
-15V
6
Square wave
output
2
3
+15V
7
R 5
C 3
-
741
+
4
Integrator
-15V
6
V out
Triangle wave
output
R 4
C 2
Wein Bridge oscillator
Figure 5: A simple circuit to generate square and triangular waves from Sin wave.
COMPONENTS
1. Digital Oscilloscope, Bread Board, Digital Multi-Meter, Signal generator.
2. DC supplies from the board.
3. Resistors: 1kΩ(2 NOs),0.27kΩ,10kΩ (3NOs),120kΩ,5kΩ
78