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目前功放的形式可谓各式各样、各具特点,但甲类功放的音质在音响界中有口皆碑。笔者改进、制作了一种甲类放大器,效果甚佳,现介绍给音响爱好者,电路见附图。图中,J1、J2和P1、P2组成第一、二级差分放大电路,本机采用具有输入阻抗高、高频响应好、工作稳定的场效应管构成第一级差分放大器,并由N1、D1、D2提供恒定的电流。N3提供输出级的静态电流,并具有温度补偿作用。N2组成P3集电极的恒流电路,P3组成动态偏压电路,随输入信号幅度的增大,P3会使N3的偏流减小,致使N3的集电极与发射极之
At present, the power amplifier can be described in various forms, each with its own characteristics, but the sound quality of Class A amplifier in the audio industry reputation. I improved, produced a Class A amplifier, the effect is very good, are introduced to audio enthusiasts, the circuit see the photo. The figure, J1, J2 and P1, P2 form the first and second differential amplifier circuit, the machine uses a high input impedance, high frequency response, stable operation of the FET to form the first differential amplifier, and N1, D1, D2 provide a constant current. N3 provides quiescent current at the output stage with temperature compensation. N2 P3 constant current collector circuit collector, P3 composed of dynamic bias circuit, with the input signal amplitude increases, P3 will reduce the bias current of N3, resulting in N3 collector and emitter of