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Refer to FIGURE 2.2 and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2020 - Paper 1
Question 2
Refer to FIGURE 2.2 and answer the questions that follow. 2.2.1 Identify the multivibrator in FIGURE 2.2. 2.2.2 Describe the operation of the multivibrator in FIGU... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 2.2 and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2020 - Paper 1
Step 1
Step 2
2.2.2 Describe the operation of the multivibrator in FIGURE 2.2 from a point where the capacitor has just discharged.
Answer
At the point where the capacitor (C1) has just discharged, the voltage across it is zero, allowing the output voltage (Vout) to switch to its high state. The resistor R1 charges the capacitor through the positive supply. As C1 charges, the voltage across it increases until it reaches a threshold voltage. Upon reaching this threshold, the output of the multivibrator will switch back to low, and the cycle begins anew, producing a continuous square wave output.
Step 3
2.2.3 Explain how the frequency of the multivibrator in FIGURE 2.2 can be increased.
Answer
The frequency of the multivibrator can be increased by reducing the values of either capacitor C1 or the timing resistor R1. This leads to a faster charging and discharging cycle of the capacitor, resulting in a higher frequency output signal.