目前音频功率放大器的输出级基本上是图1所组成的乙类推挽电路输出形式。无信号输入时，静态工作电流取得很小，消耗的功率也很小，所以效率很高。但是在输入交流信号时，一半管子在导通工作，放大输出，另一半管子则完全处于截止状态。这样，两只管子在交替工作过程中，使输出 At present, the output stage of the audio power amplifier is basically the output form of the push-pull type B circuit of FIG. No signal input, the static working current is very small, the power consumption is also very small, so high efficiency. However, when the AC signal is input, half of the tubes are on, amplifying the output and the other half of the tubes are completely off. In this way, the two tubes work alternately, so that the output