设计了一款低成本、大功率的语音放大器。该设计采用带通滤波电路对输入的音频信号进行处理，专业音频放大芯片NE5532对语音信号进行初级功率放大、三极管和大功率晶体管2N7300组成后级功率放大后推动扬声器。通过测试，该语音放大电路可以提供40 W的功率，远大于普通家用语音功率放大器，而且成本又远低于专业语音功率放大器，完全满足需要。%A low-cost,high-power voice amplifier is designed,which uses band-pass filter circuit to process the input au-dio signal,and uses professional audio amplification chip NE5532 for primary power amplification and post power made up of transistor and large power transistor 2N7300 for driving speaker. Through test,it is proved that the voice amplification circuit can provide a maximum 40 W amplifier power which is much larger than that of ordinary household voice power amplifier. What′s more,the cost is much lower than that of the professional voice power amplifier,which can fully meet the requirment.
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