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Hi-Fi界有一句至理名言,就是“简洁至上”。这就是说,假如能用一个元件或器件做成的电路,就尽量不用两个。电子电路中常用的电子元件有电阻、电容、电感等,常用的电子器件有二极管、三极管及集成电路等。电阻、电容都属于线性元件,在放大电路中可以认为不会因它们而产生非线性失真。但是,目前用于放大的电子器件,不论是电子管、晶体管,还是集成电路,统统都是非线性器件,它们是放大电路中产生非线性失真的根源。因此,在放大电路中应尽量少用管子。要做到这一点也并非容易,所以通常所见到的放大电路都比较复杂。要想“简洁”,必须解决两个问题:一是放大倍数要足够大,至少应该在接CD机时能够达到额定的输出功率;二是非线性失真要尽量小些,在不加负反馈或只加少量的负反馈时,谐波失真系数能够达到Hi-Fi要求。
Hi-Fi sector has a well-known saying is “simple and supreme.” This means that if you can use a component or device made of the circuit, try not to use two. Electronic circuits commonly used in electronic components are resistors, capacitors, inductors, commonly used electronic devices have diodes, transistors and integrated circuits. Resistors, capacitors are linear components, in the amplifier circuit can not think they will not produce nonlinear distortion. However, the current electronic devices used for amplification, whether they are tubes, transistors or integrated circuits, are all non-linear devices. They are the source of non-linear distortion in the amplifier circuit. Therefore, in the amplifier circuit should be minimal use of the tube. It is not easy to do this, so the amplifying circuit that we usually see is more complex. To “concise”, we must solve two problems: First, the magnification should be large enough, at least should be connected to the CD machine can reach the rated output power; Second, the nonlinear distortion should be as small as possible, without negative feedback or only With a small amount of negative feedback, the harmonic distortion factor meets Hi-Fi requirements.