Refer to FIGURE 3.1 and answer the questions that follow - NSC Electrical Technology Digital - Question 3 - 2019 - Paper 1
Question 3
Refer to FIGURE 3.1 and answer the questions that follow.
3.1.1 State how you would identify pin 1 of the IC in FIGURE 3.1.
3.1.2 List the THREE stages into which ... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 3.1 and answer the questions that follow - NSC Electrical Technology Digital - Question 3 - 2019 - Paper 1
Step 1
State how you would identify pin 1 of the IC in FIGURE 3.1.
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Answer
Pin 1 can be identified by its position, which is the first pin to the left and below the indentation of the IC. Alternatively, it can be identified as the pin closest to the dot on the body.
Step 2
List the THREE stages into which the internal circuit of the op-amp is divided.
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Input stage or differential amplifier
Intermediate stage or high gain differential amplifier
Output stage or common collector
Step 3
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, ensuring consistent performance under varying conditions.
It reduces distortion of the output signal, leading to a more accurate representation of the input.
Step 4
Calculate the output voltage based on the data given in the circuit.
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The output voltage can be calculated using the formula:
VOUT=VIN(−RINRF)
Substituting the given values:
VOUT=2V(−12×103Ω100×103Ω)=−16.67V
Step 5
Explain why the output waveform is NOT an exact replica of the input waveform.
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The output waveform is not an exact replica because the amplifier is driven into saturation, which causes clipping of the waveform's peaks and troughs. Additionally, if the input is fed into the inverting terminal, there will be a 180-degree phase shift between the input and output.
Step 6
Identify the maximum output voltages ($V_{OUT}$).
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The maximum output voltages are +15 V and -15 V, as indicated by the power supply levels.
Step 7
Rewrite the abbreviation DIP in full.
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Dual In-line Package
Step 8
Name THREE modes of operation of the NE555 IC.
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Astable mode
Monostable mode
Bistable mode
Step 9
Identify the typical trigger voltage of the NE555 IC on the data sheet when the supply voltage is +15 V.
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The typical trigger voltage is 5 V.
Step 10
Explain what will happen to the output of an NE555 IC when the trigger voltage rises above the threshold voltage level of 10 V.
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When the trigger voltage rises above the threshold level of 10 V, the output of the NE555 timer will switch from high to low, thereby changing its state.
