基于Multisim的音频功率放大电路设计  

Design of Audio Power Amplifier Circuit Based on Multisim

作　　者：姜雪菲 JIANG Xuefei(Weifang Engineering Vocational College,Weifang 262500,China)

机构地区：[1]潍坊工程职业学院,山东潍坊262500

出　　处：《青岛大学学报（工程技术版）》2022年第4期68-72,共5页Journal of Qingdao University(Engineering & Technology Edition)

摘　　要：为了解决市场上音频设备存在的噪音多、增益不可调等问题,本文设计了一款音频功率放大电路。该电路由前置放大电路、功率放大电路两级放大电路以及滑动变阻器构成,其中,前置放大电路通过芯片LM324AD与外围电阻连接成同相比例运算放大电路;功率放大电路采用芯片LM386以及外围电阻、电容进行功率放大,而两级放大电路之间通过滑动变阻器实现增益调节。为了验证该电路的性能,采用Multisim仿真软件进行了信号测试。结果表明,该功率放大器具有较低的失真度且能够实现根据需求调节放大电路的增益,从而降低可输出的噪音干扰,提高音频播放质量。该放大器整体设计比较简单,成本较低,具有实际推广应用价值。In order to solve the problems of high noise and unadjustable gain in the audio equipment on the market,this paper designs an audio power amplifier circuit,which consists of a preamplifier circuit and a power amplifier circuit two-stage amplifying circuit and a sliding rheostat.The amplifier circuit is connected to the same-phase proportional operational amplifier circuit through the chip LM324AD and the peripheral resistor.The power amplifier circuit uses the chip LM386 and peripheral resistors and capacitors to amplify the power,and the sliding rheostat is used between the two-stage amplifier circuits to achieve gain adjustment.In order to verify the performance of the circuit,this paper uses the Multisim simulation software to test the signal.The results show that the power amplifier has low distortion and can adjust the gain of the amplifier circuit according to the needs,thereby reducing the output noise interference and improving the audio frequency quality of playback.The overall design of the amplifier is relatively simple,the cost is low,and it has practical promotion value.

关 键 词：功率放大 音频 直流稳压电源 LM324AD LM386 MULTISIM 

分 类 号：TN721.5[电子电信—电路与系统]