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一般的多谐振荡器有下述缺点:电路元件较多,输出波形不理想,改变频率比较麻烦,输出阻抗高,带负载能力差等等。下面这个自激多谐振荡器可以克服上述缺点。图1是振荡器的原理图。振荡器在改变频率时,只需改换一只电容器的电容量就可以实现频率粗调。频率范围可以自0.01赫到1兆赫。输出脉冲为矩形波。频率在100赫以上时,脉冲的前沿,后沿都不大于0.2微秒。电路具有较小的输出阻抗,如果负载是100欧左右(但
The general multivibrator has the following disadvantages: more circuit components, the output waveform is not ideal, change the frequency of more trouble, the output impedance is high, with poor load capacity and so on. The following self-excited multivibrator can overcome the above shortcomings. Figure 1 is the oscillator schematic. Oscillator in changing the frequency, just change the capacitance of a capacitor can be coarse frequency. The frequency range can be from 0.01 Hz to 1 MHz. The output pulse is a rectangular wave. When the frequency is above 100 Hz, the leading and trailing edges of the pulse are no greater than 0.2 microseconds. The circuit has a smaller output impedance, if the load is around 100 ohms (but