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本文介绍的功率放大器,元件少、造价低、输出功率2×5.8W,可在15～20mm~2居室中应用。由于该放大器采用了立体声展宽电路,可将左右声道相对扩展30°。一、电路原理如附图所示(R、L声道的原理图相同,现以R声道为例),线路输出的音频信号经音量电位器W_1、电容C_1进入前置放大级BG_1,R_1、R_2为该级偏置电阻,R_4为负反馈电阻,以改善该级音质。放大后的信号经C_3送入衰减式音调电路(W_2、W_3分别为高、低音调电位器),然后经C_8耦合至功放集成电路BA 532的5脚,放大后的信号,一路经C_(14)、R_(12)、R_(13)、C_(15)、C_(16)选频后,再经C_(18)和R_(14)反馈至L声道BA 532的反向输入端6脚,将立体声展宽。不需展
This article describes the power amplifier, less components, low cost, the output power of 2 × 5.8W, can be used in 15 ~ 20mm ~ 2 bedroom. As the amplifier uses a stereo widening circuit, the left and right channels can be relatively extended 30 °. First, the circuit principle As shown in the figure (R, L channel schematic is the same, now the R channel, for example), the audio signal output by the volume potentiometer W_1, C_1 into the preamplifier stage BG_1, R_1 , R_2 for the level of bias resistors, R_4 for the negative feedback resistance, in order to improve the level of sound quality. The amplified signal is fed into the attenuating tone circuit (W_2, W_3, respectively, high and low pitch potentiometers) via C_3, and then coupled to pin 5 of amplifier integrated circuit BA 532 through C_8. The amplified signal is amplified by C_ (14) ), R_ (12), R_ (13), C_ (15) and C_ (16) are selected and then fed back to the inverting input terminal 6 of L channel BA 532 through C_ (18) and R_ , Widen the stereo. No show