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在电子仪器及控制仪表中经常需要这样一种多谐振荡器,该振荡器具有两路相位相反的幅值足够高的输出,只要改变单个电路元件就能方便地改变振荡频率而保持方波的占空系数(低电位宽度与周期之比)不变。这里提出一种“射极耦合单电容多谐振荡器”线路,可分别从晶体管BG_2集电极和射极耦合电阻Re上输出相位相反、幅值相等的方波(图1)。当改变电容器C的大小时,输出方波频率相应发生改变,但保持占
In electronic instruments and control instruments often require such a multivibrator, the oscillator has two opposite phase amplitude high enough output, as long as the change of a single circuit element can easily change the oscillation frequency while maintaining the square wave Duty factor (ratio of low potential width to period) unchanged. Here, a “emitter-coupled single-capacitor multivibrator” circuit is proposed, which can output square-wave with opposite phase and equal amplitude (Figure 1) respectively from the collector and emitter coupling resistor BG of transistor BG_2. When changing the size of capacitor C, the output square wave frequency changes correspondingly, but keep accounting