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The transistor character curve plotter composed of 555

2016-04-06 20:15  
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The transistor character curve plotter composed of 555
In the figure is the transistor character curve plotter composed of 555. See as figure (a), the circuit consists of the sawtooth wave generator and step wave generator. As it needs two voltages to draw the transistor character, one is the step wave on the b pole, which generates different base currents lb; the other is the sawtooth wave on the c pole, whose period is corresponding to the step wave, so the output character curve of the transistor can be drawn out, i.e Ic-Vce character curve. The sawtooth generator consists of the oscillator (IC(555), R1, R2 and C1) and integral circuit (C2 and R3).