FIGURE 4.1 below shows an operational amplifier - NSC Electrical Technology Digital - Question 4 - 2021 - Paper 1
Question 4
FIGURE 4.1 below shows an operational amplifier. Answer the questions that follow.
4.1.1 Identify the type of operational amplifier in FIGURE 4.1.
4.1.2 Draw the o... show full transcript
Worked Solution & Example Answer:FIGURE 4.1 below shows an operational amplifier - NSC Electrical Technology Digital - Question 4 - 2021 - Paper 1
Step 1
4.1.1 Identify the type of operational amplifier in FIGURE 4.1.
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Answer
The operational amplifier depicted in FIGURE 4.1 is a Non-Inverting Operational Amplifier.
Step 2
4.1.2 Draw the output voltage waveform on the ANSWER SHEET for QUESTION 4.1.2.
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The output voltage waveform is a sinusoidal wave that follows the input waveform but is amplified. The output waveform should show amplitude characteristics without distortion.
Step 3
4.1.3 Explain why operational amplifiers are known as differential voltage amplifiers.
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Operational amplifiers are referred to as differential voltage amplifiers because they amplify the difference between two input voltage signals. This means that they take the voltage from both inputs, subtract one from the other, and amplify the result.
Step 4
4.1.4 Give TWO reasons why negative feedback is important when the op amp is used as a linear amplifier.
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It stabilizes the amplifier by controlling its gain.
Negative feedback reduces the distortion of the output signal, enhancing the linearity and bandwidth of the amplifier.
Step 5
4.2.1 Explain the function of the RS flip-flop.
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The RS flip-flop stores the information it last received until new information is received, thus maintaining one of two stable states.
Step 6
4.2.2 State the typical operating voltage range of the 555 IC.
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The typical operating voltage range of the 555 IC is from +5 V to +15 V or +18 V.
Step 7
4.2.3 Explain the function of the three 5 kΩ resistors inside the 555 IC.
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The three 5 kΩ resistors divide the supply voltage into three equal values, which are used by the two comparators inside the 555 timer.
Step 8
4.2.4 Name TWO modes of operation for the 555 IC.
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Astable Mode
Monostable Mode
Step 9
4.2.5 Explain the function of the threshold input on Pin 6 of a 555 IC.
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The threshold input on Pin 6 of a 555 IC monitors the voltage, and when the threshold voltage (two-thirds of Vcc) is exceeded, the IC will reset.
Step 10
4.3 Refer to FIGURE 4.3 below and explain why the output is zero volts.
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Answer
The 741 op-amp amplifies the difference between the two input voltages. If both inputs are equal, the output will be zero volts, effectively canceling each other out.
