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In audio D amplifier, if they are in single-ended mode and they use a single-supply we need to use a DC-blocking capacitor. Otherwise we don't. Why is that?
To be able to generate positive and negative swing the PWM centers around 50% duty cycle, so you have some non zero DC voltage. This needs to be filtered with a capacitor.
In a dual supply the 50% duty cycle will Center around 0V and therefor no need for a capacitor.
In audio D amplifier, if they are in single-ended mode and they use a single-supply we need to use a DC-blocking capacitor. Otherwise we don't. Why is that?
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