An electronic system, in some embodiments, comprises: a power source; a load coupled to the power source; an analog-to-digital converter, coupled to the power source and the load, that samples a fluctuating voltage supplied by the power source and generates a digital representation of said fluctuating voltage; control logic, coupled to the analog-to-digital converter, that generates an amplitude correction signal based on said digital representation of the fluctuating voltage and on a target voltage; correction logic, coupled to the control logic, that uses the amplitude correction signal and an audio signal to generate a switch control signal; and an output driver, coupled to the correction logic, that controls coupling between the power source and the load based on the switch control signal.