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Relaxation Oscillation Circuit of Unijunction Transistor

2016-05-07 04:12  
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Relaxation Oscillation Circuit of Unijunction Transistor
The relaxion oscillating circuit which is composed of uijunction transistor is showed as the picture (a).The initial voltage of capacitor is set to 0.The power supply charges the capacitancevia the resistance R when the power is switched UA of uijunction transistor depends on power voltage E(Ubb) and devices' current-voltage characteristic and peaks and valleys point are also determined by this.Capacitor voltage rises in accordance with the index.Emitter current is small before emitter voltage reaches peak and two ends voltage can be ignored becuase the current that passes through R1 is very small.The uijunction transistor enters negative resistance area and then the diode current flows when the voltgae reaches the peak and UC is equal to UP.