An undergraduate laboratory experiment to build and characterize a thermionic triode for use as an audio amplifier

An undergraduate laboratory experiment to build and characterize a thermionic triode for use as an audio amplifier
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本科生实验室实验,用于构建和表征用作音频放大器的热电子三极管

DOI:
10.1088/1361-6404/aba997
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发表时间:
2020
影响因子:
0.7
通讯作者:
Murray A
Murray A
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Murray A

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虽然在很大程度上被用于小信号放大的晶体管所取代,但在高保真音频放大器、吉他放大器和高功率无线电和电视发射机中仍然可以找到使用,其中它们的功率尺寸可扩展性优于固态器件。在这里详细介绍的本科生实验中,学生在真空室内构建一个放大器,并研究不同设计对信号增益的影响。测量了它们的三极管特性,以确定信号放大的最佳条件。然后,使用放大器放大音频信号以确定频率响应,并且他们可以使用他们选择的输入信号通过耳机收听结果。因此,本实验向学生介绍真空技术,电子束和模拟电子学。
Although largely superseded by transistors for small signal amplification, the thermionic valve (or tube) still finds use in high-fidelity audio amplifiers, in guitar amplifiers and in high-power radio and television transmitters, where their power to size scalability has advantages over solid state devices. In the undergraduate experiments detailed here students construct a triode inside a vacuum chamber, and investigate the effects of different designs on signal gain. The characteristics of their triodes are measured to determine the optimal condition for signal amplification. The triode is then used to amplify an audio signal to determine the frequency response, and they can listen to the results via headphones using an input signal of their choice. This experiment hence introduces students to vacuum technology, to electron beams and to analog electronics.
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