The signal that goes through C2 drop across R3 is a voltage signal sound. In addition, C2 to prevent voltage direct current flows into the speaker. The audio is converted to electrical signals through C2. When the signal sounds into the speakers. That matching the input impedance of the Impact of Impact Speaker impedance low. When entering the power supply circuit for Q1 will work as an amplifier in a common base. This is the generally Microphone Preamplifier circuit. This circuit can help us modify the normal small speaker to the microphone as a pre-mic circuit. We sometimes need a Simple microphone, But we cannot find it.
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