Integrated circuit interphone circuit diagram

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Send to the 5G31 integrated circuit for low-frequency power amplification , and then push the 8 ohm speaker to emit voice. After pressing K1, the whole machine is in the transmitting state. The speaker is used as a microphone to change the voice of the call into an electrical signal, and the low frequency is amplified by the 5G31 to modulate the carrier frequency signal. BG3 constitutes the main vibration level, which generates 27 MHz and the amplitude carrier frequency signal, and is amplified by BG5. The audio signal sent by 5G31 is simultaneously added to BD6.