FIGURE 3.1 below shows two signals with the same frequency and amplitude that are applied onto the inputs of a 741 op amp - NSC Electrical Technology Digital - Question 3 - 2019 - Paper 1
Question 3
FIGURE 3.1 below shows two signals with the same frequency and amplitude that are applied onto the inputs of a 741 op amp. Answer the questions that follow.
3.1.1 W... show full transcript
Worked Solution & Example Answer:FIGURE 3.1 below shows two signals with the same frequency and amplitude that are applied onto the inputs of a 741 op amp - NSC Electrical Technology Digital - Question 3 - 2019 - Paper 1
Step 1
Write down the typical operating (supply) voltages of an op amp.
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Answer
The typical supply voltages for a 741 operational amplifier are +15 V and -15 V.
Step 2
Determine the value of the output voltage.
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Answer
In a condition where the inputs are equal, the output voltage is 0 V due to common mode rejection.
Step 3
Describe what will happen to the output signal if the amplitude of the signal on the non-inverting input is increased.
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Answer
If the amplitude of the signal on the non-inverting input is increased, the op amp will amplify the difference between the two inputs. Since the non-inverting input becomes greater than the inverting input, the output signal will increase accordingly and will be in phase with the non-inverting input.
