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上期《电子世界》(2010年8月)介绍了《Yamaha的CT-7000纯FM收音头》上半部分,本期将继续做详细介绍。 CT-7000的MPX电路 MPX电路就是常说的立体声解调电路、FM前端电路,如下图所示,限于篇幅,电路被分成了两部分,一部分是信号通道(图8),一部分是控制通道(图9),均由分立元件构成。如果彻底搞懂了这部分电路,几乎就可以去设计立体声解调的集成电路了。需要注意的是,这里的控制通道仅仅是指MPX来说的,与整机电路中的控制板并不是一回事。
The last issue of “Electronic World” (August 2010) introduced the first half of “Yamaha’s CT-7000 Pure FM Radio Head”, which will be covered in more detail in this issue. CT-7000 MPX circuit is often said stereo demodulation circuit, FM front-end circuit, as shown below, due to space limitations, the circuit is divided into two parts, part of the signal channel (Figure 8), part of the control channel Figure 9), are composed of discrete components. If you completely understand this part of the circuit, you can almost go to design a stereo demodulated integrated circuit. It should be noted that the control channel here refers only to the MPX, and the whole circuit board is not the same thing.