Abstract
This thesis describes the designs of pulse width modulator used NE555 and LM339 .It also can be built up a Class-D audio power amplifier, whose working efficiency is high and be easy to connect with other equipments.
In this paper it introduced the work character of PWM, the overall structure and the working pattern. It made a analysis of work principle of Class-D audio power amplifier with PWM switching power, and it introduces the practical application of Class-D audio power amplifier, as well as future market development tendency.
This article also introduced the design of system and realization of the hardware unit electric circuit in detail. The practice proved that, this system is stable with high working efficiency and the usability is strong and so on. It has the simple structure and be easy to realize.
