Explain how a positive voltage from the audio input causes t

Explain how a positive voltage from the audio input causes the output duty cycle to decrease, making the output waveform spend more time at the negative rail than at the positive rail.

Solution

The system reaches the positive voltages from the audio input it integrates to saturate. This results in output voltage remaining at constant value near the particular rail. This makes to produce a long interval time because they are intended to spend more time at negative rail.