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 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 should mirror the input waveform, amplified without distortion. The output waveform will appear sinusoidal and aligned with the input waveform but with a higher amplitude.
Step 3
4.1.3 Explain why operational amplifiers are known as differential voltage amplifiers.
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Operational amplifiers are termed differential voltage amplifiers because they amplify the difference between the voltages at their two input terminals. This characteristic allows them to reject common signals, enhancing their ability to process distinct inputs.
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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Negative feedback helps in stabilizing the gain of the amplifier, ensuring consistent performance over varying conditions.
It reduces distortion in the output signal, improving the fidelity of the amplified signal.
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 provided, maintaining stable states based on inputs.
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 between 5 V to 15 V or up to 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 parts, which are used by the two comparators within the IC to determine output states.
Step 8
4.2.4 Name TWO modes of operation for the 555 IC.
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Astable Mode - the 555 operates as an oscillator.
Monostable Mode - it produces a single output pulse in response to an input trigger.
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 monitors the voltage of the 555 IC. When the threshold voltage (typically 2/3 of Vcc) is exceeded, the circuit will trigger and change its output state.
Step 10
4.3 Explain why the output is zero volts.
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The output of the 741 op-amp is zero volts because it amplifies the difference between the two input voltages, which, in this case, are equal. This means the op-amp is in a balanced state, resulting in an output of zero volts.
