The PWM audio amplifier belongs to the class D audio amplifier. Its main working principle is to control the output signal amplitude by adjusting the pulse width.
Main Components of a PWM Audio Amplifier
Input Signal Processing Module
Main components: Typically, an input buffer or preamplifier, a noise filter, or a coupling capacitor.
Function: Conditions the input signal to set gain, filters noise, and prepares it for modulation.
Driver Module
The PWM modulator is a key driver component of a PWM audio amplifier, primarily converting analog audio signals into PWM pulse-width modulated signals. High-efficiency output is achieved through the rapid on-off switching of switching transistors (such as MOSFETs).
For example, the NTP8204G transistor audio amplifier from OFweek Mall uses two full-bridge MOSFET transistor switches to ensure efficient operation.
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Low-pass Filter: Filters out high-frequency components from the PWM signal, retaining only the rectified output waveform at the same frequency as the input audio frequency, ensuring sound quality.
Feedback and Control Circuit
Key components: An operational amplifier (used in the feedback network) and a control IC or DSP to ensure accurate signal reproduction and system stability.
Power supplies
Mainly DC power supplies or SMPSs, along with voltage regulators, provide stable power for the efficient operation of switching transistors.
Understanding the main components of a PWM audio amplifier will help DIY electronics enthusiasts gain a more systematic understanding of its circuit structure and signal amplification process. Welcome to visit OFweek Mall to get high-quality audio amplifiers online.
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