一种供示波器使用的测试板研制  

Fabrication of a Circuit of Signal Generator

作　　者：马益平[1] 杜英杰[1] 高爱华[1] 周引穗[1] 

机构地区：[1]西北大学物理学系,陕西西安710069

出　　处：《电子测试》2013年第9期92-94,共3页Electronic Test

摘　　要：针对大学物理示波器的使用实验中,函数发生器产生的标准波形不利于训练学生捕获微弱和特殊信号的能力,设计一种简易有源信号发生电路。该电路利用了单结晶体管的开关特性,结合可调的RC电路,不但可以产生频率可调的正弦波,矩形板,三角波和锯齿波,而且可以产生频率可调的正负脉冲,不规则波形等特殊波形。另外在正弦信号产生电路中附加一个RC移相电路,学生可以根据李萨茹图形,判断两正交叠加信号的相位差。该电路简易直观也适合电子线路初学者使用。For the usage of oscilloscope in college physics experiment, the standard waveforms generated by signal generator prevent the ability to trap weak signal or special signal. To overcome this defect, we design a convenient signal generator circuit. This circuit combines the switch effect of unijunction transistor and adjustable RC circuit. This signal generator can not only produce several classical waveforms with variable frequencies, but also can generate sharp positive or negative pulse and special periodic waves. Furthermore, in order to stimulate interests, Lissajous is applied to distinguish the phase difference of two sine waves. The circuit is also useful for the primary learner on electronics.

关 键 词：单结晶体管 RC电路 李萨茹图形 

分 类 号：TM935.3[电气工程—电力电子与电力传动]