摘要：功率放大器簡稱“功放”。很多情況下主機的額定輸出功率不能勝任帶動整個音響系統(tǒng)的任務(wù)，這時就要在主機和播放器設(shè)備之間加裝功率放大器來補充所需要的功率缺口，而功率放大器在整個音響系統(tǒng)中起到了“組織、協(xié)調(diào)”的樞紐作用，在某種程度上主宰了整個系統(tǒng)能否提供良好的音質(zhì)輸出。本設(shè)計為雙聲道音調(diào)可調(diào)功率放大器，是一個配有負反饋音調(diào)可調(diào)電路以及音量調(diào)節(jié)電路的功率放大器，該設(shè)計可以完成雙聲道音調(diào)高低音分別調(diào)節(jié)，音量分別調(diào)節(jié)的功能，在聽覺上，可以滿足人們更高要求的聽覺享受。本設(shè)計采用了NE5532和LM1875兩種芯片，前者主要使用在前級放大部分以及負反饋部分，而后者使用在集成功率放大電路中，均完成不同倍數(shù)的放大要求。使用便捷，使得音源信號得到良好的輸出效果。

關(guān)鍵字：音調(diào)可調(diào)   功率放大電路  電路分析

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