ECE 232
Lab1
Inverting Amplifier, Integrator, Differentiator
Experimental Work:
1. Set up the inverting amplifier circuit shown below using op-amp (LM741) and sketch the
input (connected to CH1 of the oscilloscope) and output (connected to CH2 of the
oscilloscope) waveforms.
CH 1
R1
R2
1.2k
12 k
Vin=S inusoid al
VAMPL = 1V
FREQ = 50 0 Hz
74 1
2
3
+ 12
7
4 OUT 6
+
+
CH 2
- 12
OPAMP
-
Settings of CH1 and CH2
CH1 Volt/div: 1 Volt/div
CH2 Volt/div: 5 Volt/div
Sec/div: 1 msec
2.a. Set up the circuit below. Give a square input having 1 Volt peak value (2 Volt peak-topeak value) and 500 Hz frequency. Sketch the input and the output waveforms. In what way
are input and output waveforms related. (This is a differentiating circuit.)
CH 1
C1
R2
47n
12k
Vin=Square wave
VAMPL = 1 V
FREQ = 500 Hz
741
2 3
+ 12
7
4 OUT 6
+
- 12
OPAMP
Settings of CH1 and CH2
CH1 Volt/div: 1 Volt/div
CH2 Volt/div: 5 Volt/div
Sec/div: 250 μsec
+
CH 2
-
2.b. Instead of square wave if triangular wave is given to the circuit, what will happen? Plot
the input and output waveforms.
Settings of CH1 and CH2
CH1 Volt/div: 1 Volt/div
CH2 Volt/div: 1 Volt/div
Sec/div: 500 μsec
3. In the following circuit the input is a square waveform of 2 Volt peak-to-peak value with
0V DC offset and f=500 Hz frequency. Sketch the input and output waveforms. Comment on
the input and output waveforms. In what way they are related. (This is an integrating circuit).
R2
R1
CH 1
1M
C
10 0k
10 n
Vin=S quare wave
VAMPL = 1 V
FREQ = 50 0 Hz
74 1
2
3
+ 12
7
4 OUT 6
+
- 12
OPAMP
Settings of CH1 and CH2
CH1 Volt/div: 1 Volt/div
CH2 Volt/div: 1 Volt/div
Sec/div: 1 msec
Equipment list:
Resistors: 1.2kΩ, 12kΩ, 100kΩ, 1MΩ
Capacitors: 47nF, 10nF
+
CH 2
-