题目内容
Build the circuit on breadboard. Measure the voltage between the microphone by a multimeter .
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Connect the oscilloscope test probe to the circuit. Adjust the setting properly until the shape of the signals is clear.
Measure the peak-to-peak amplitude of the signal.
When you talk into the microphone, the signals you get are small. To make them bigger, you need an amplifier. One possible circuit is an operational amplifier circuit.
The minus sign appears because this is an inverting amplifier circuit, that is, the output waveform has the same shape as the input waveform, but is turned upside down, or inverted, compared with the input waveform.
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