The output only has tiny change, so we modified the circuit by changing resistors of different values. As a result, the voltage gain increase several times than before. At the same time, we change the values of resistors in the secondary circuit, so the input voltage of pin 2 decreased than before. When the value of pin 3 is larger than pin2, the second part can work. Finally, the output of second part can be obtained by oscilloscope.
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