Refer to FIGURE 2.1 below and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2021 - Paper 1
Question 2
Refer to FIGURE 2.1 below and answer the questions that follow.
2.1 Identify the multivibrator in FIGURE 2.1.
2.1.2 State the polarity of the pulse provided on the... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 2.1 below and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2021 - Paper 1
Step 1
Identify the multivibrator in FIGURE 2.1.
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Answer
The multivibrator in FIGURE 2.1 is a monostable multivibrator.
Step 2
State the polarity of the pulse provided on the inverting input when switch S1 is pressed.
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Answer
When switch S1 is pressed, the polarity of the pulse provided on the inverting input is negative.
Step 3
State TWO functions of the 741 op-amp in the circuit.
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Answer
The 741 op-amp is used to amplify the voltage difference between its inverting and non-inverting inputs.
It acts as a comparator to produce a high or low output based on the input voltage levels.
Step 4
In which LED will be illuminated when S1 is pressed.
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When S1 is pressed, the LED connected to the output of the op-amp will illuminate.
Step 5
State the polarity of the voltage present on pin 3 after switch S1 is pressed.
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Answer
The polarity of the voltage present on pin 3 after switch S1 is pressed is positive.
