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Refer to FIGURE 2.4 below and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2019 - Paper 1
Question 2
Refer to FIGURE 2.4 below and answer the questions that follow. FIGURE 2.4: MULTIVIBRATOR Explain why there is a difference in the charging and discharging times ... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 2.4 below and answer the questions that follow - NSC Electrical Technology Digital - Question 2 - 2019 - Paper 1
Step 1
Explain why there is a difference in the charging and discharging times of the capacitor.
Answer
The difference in charging and discharging times of the capacitor in a multivibrator circuit can primarily be attributed to the values of the resistors involved. The capacitor charges through both resistors R1 and R2, which results in a longer time constant due to the combined resistance slowing down the voltage rise. Conversely, during the discharging phase, the capacitor discharges only through resistor R2, which generally has a lower value compared to the series combination of R1 and R2. As a result, the discharging time is typically shorter than the charging time.
Step 2
Draw the output signal on ANSWER SHEET 2.4.4.
Answer
The output signal waveform for the multivibrator can be represented as a square wave, alternating between high and low states, corresponding to the capacitor charging and discharging phases. The voltage will rise from 0V to the supply voltage and then drop back down in a periodic manner, reflecting the output switching between high and low at intervals determined by the time constants of charging and discharging.