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语言放音机的前置放大器和录音放大器采用的是性能优越、功能较全的双声道集成电路 TA7668AP 或 D7668。下面,笔者以 TA7668AP 在语言放音机中的应用电路为例进行分析。一、电路分析TA7668AP 的内部结构见图1。从图1中可以看出,它有左、右两个独立的声道,每个声道设有前置和后级放大
The preamplifiers and recording amplifiers of the language players use the dual-channel integrated circuit TA7668AP or D7668 with superior performance and full functionality. Below, the author uses the TA7668AP application circuit in the language player as an example for analysis. I. Circuit Analysis The internal structure of TA7668AP is shown in Figure 1. As can be seen from Figure 1, it has two independent left and right channels, each channel has a preamplifier and post amplification