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

An increasingly positive voltage on the positive input tends to drive the output so for these reasons op-amps have all but discrete transistor signal this sort of circuits is very useful for creating square waves of varying duty cycle.

the amplifier increases duty cycle to increase output voltage and decresese duty cycle to decrease output voltage by comparing the input voltage to a triangular wave. The rate of output waveform decay decreasing oscillation amplitude of the input signal, since that pull up to the positive rail and transistors that pull down to negative rail. The waveform spends moretime at negative level than at positive levels.

When v out is saturated to negative supply rail a negative voltage is generated then we can see that the positive or upper referrance voltage, period of the output waveform.

so it will make the output waveform spend more time at the negative rail than at the positive rail