Wireless ward caller host alarm sounding circuit

Single chip microcomputer STM32L151CCU6
After receiving the call signal, the host first sends an alarm to the on-duty personnel. The alarm circuit can use the single-chip P2.0 output 1 kHz and 500 Hz audio signals to be amplified to drive the speaker and send an alarm signal. Wireless ward caller host alarm sounding circuit:
Figure 8 host alarm sounding circuit

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