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4 Efficient PWM Amplifier Circuits Explained - …
https://www.homemade-circuits.com/4-efficient-pwm-amplifier-circuits-explained/
Audio amplifiers which are designed to amplify an analogue audio signal through pulse width modulation or PWM processing and with adjustable duty cycle is known by many names including digital amplifier, Class-D amplifier, switched amplifier and PWM amplifier.
Sound amplifier from PWM pin - General Electronics ...
https://forum.arduino.cc/t/sound-amplifier-from-pwm-pin/326589
The way to amplify a PWM output is class-D - the output is boosted by a half-H-bridge to high current version (or higher voltage, higher current). You can take the complement of the signal and boost that too, allowing a full-bridge class D output stage, meaning no large electrolytic blocking capacitor is needed. Noise shaping:
555 Audio PWM Apmlifier | Full Circuit with Explanation
https://www.electronicsforu.com/electronics-projects/555-audio-pwm-amplifier
The ubiquitous 555 timer IC handles audio signals in its own pulse-width modulation (PWM) way. Here, the 555 IC works in astable mode. The switching frequency can be varied from 65 kHz to 188 kHz. Selection of PWM frequency depends on the amplitude of the input signal as well as the load impedance.
Class-D audio amplifier implementation on STM32 32 …
https://www.st.com/resource/en/application_note/dm00477514-classd-audio-amplifier-implementation-on-stm32-32bit-arm-cortex-mcus-stmicroelectronics.pdf
The amplifier consists of a software modulator, a pulse width modulator (PWM) timer and an external H-bridge power stage. The first section of this document presents the Class-D amplifier principle, and the main parameters that need to be taken into account to achieve good audio listening quality.
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