摘要：功率放大器简称“功放”。很多情况下主机的额定输出功率不能胜任带动整个音响系统的任务，这时就要在主机和播放器设备之间加装功率放大器来补充所需要的功率缺口，而功率放大器在整个音响系统中起到了“组织、协调”的枢纽作用，在某种程度上主宰了整个系统能否提供良好的音质输出。本设计为双声道音调可调功率放大器，是一个配有负反馈音调可调电路以及音量调节电路的功率放大器，该设计可以完成双声道音调高低音分别调节，音量分别调节的功能，在听觉上，可以满足人们更高要求的听觉享受。本设计采用了NE5532和LM1875两种芯片，前者主要使用在前级放大部分以及负反馈部分，而后者使用在集成功率放大电路中，均完成不同倍数的放大要求。使用便捷，使得音源信号得到良好的输出效果。

关键字：音调可调   功率放大电路  电路分析

Abstract: Power amplifier hereinafter referred to as "pa". In many cases the host a rated output of power is not competent for lead all the sound system task, would then the hosts and players before the power amplifier equipment to supplement need power gap, and power amplifier sound system in the whole play a "organization, coordination" role of the hub, and in a way that dominated the whole system can provide good quality output. This design of double track tones adjustable power amplifier is a negative feedback tones with adjustable circuit and the volume control circuit of the power amplifier, this design can complete double track high bass tones, regulate, volume, regulate the function, in the hearing, and can meet the requirements of the higher people enjoy hearing. This design uses NE5532 and LM1875 two chips, the former used mainly in the former stage of negative feedback amplifier and part, and the latter in integrated power amplifier circuit used, are all finish different multiples magnification requirements. Easy to use, make audio signal get good output effect.

Key word：Tones adjustable   Power amplifier circuit   Circuit analysis