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The Transistor Characteristic Curve Drawer Circuit Composed

2016-05-07 01:13  
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The Transistor Characteristic Curve Drawer Circuit Composed of 555
The circuit shown in figure one consists of sawtooth wave generator and step wave generator.To draw the transistor characteristic curve two kind of voltage are needed. First is the step wave that put on pole b to generate different base current.Second the sawtooth wave that put on pole c, its periodic time corresponding to the step wave to draw the transistor output characteristic curve,the Ic-Vce characteristic curve.The sawtooth generator consists of multivibrator (IC(555)、R1、R2、C1) and intergrator(C2,R3).And the oscillation frequency of the multivibrator is f=1.44/(R1+2R2)C1.