Military College of Signals
National University of Sciences
& Technology
ELECTRONIC CIRCUIT DESIGN, LAB
Submitted to: Lab Eng. Amir Ali
Open Ended Lab
Submission Date:
Group Members Details
S. No
Names
1
Wahaj Shahid Goraya
6/10/2024
Open Ended Lab
Problem Statement:
Design summing amplifier using 2-LM 741 Operational amplifiers, that will sum.
2volt (peak-to-peak) + 2volt (peak-to-peak), Set frequency to 500 Hz.
Part 1:
Gain of Av1= -1
Gain of Av2 = 2
Part 2:
Gain of Av1= 1
Gain of Av2 = 2
Draw input and output waveforms.
Objective:
•
Demonstrates the design and operation of summing amplifiers.
Material Required:
•
•
•
•
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2 LM741 op-amp
Oscilloscope
Function Generator
4 10kΩ resistors
2 47kΩ resistor
Schematic Diagrams:
Figure 1: Schematic for Part 1
Figure 2: Schematic for Part 2
Procedure:
•
Part 1:
1. Connect the circuit on breadboard as shown in Figure 1.
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2. Set the input voltage to 2 peak-to-peak in function generator. Set the frequency to
500Hz.
3. For measuring gain of first amplifier connect oscilloscope at pin 6 of first LM741.
Note the value of output peak-peak voltage. Use the formula below to find gain:
𝑉𝑜𝑢𝑡
𝐴𝑣 =
𝑉𝐼𝑛
4. For measuring gain of second amplifier, repeat above process for second LM741.
Part 2:
1. Build the circuit on a breadboard following the instructions in Figure 2.
2. Use a function generator to create a sine wave with a peak-to-peak voltage of 2 volts
and a frequency of 500 Hz. Apply this signal to the input of the circuit.
3. To measure the gain of the first amplifier, connect an oscilloscope to pin 6 of the first
LM741 chip. Record the peak-to-peak voltage of the output signal. Use the provided
formula to calculate the gain.
𝑉𝑜𝑢𝑡
𝐴𝑣 =
𝑉𝐼𝑛
4. Repeat step 3 for the second LM741 chip to find its gain.
Simulations Analogue Analysis:
Figure 3: Analogue Analysis Part 1
Figure 4: Analogue Analysis Part 2