Circuit working principle: This circuit is mainly composed of sounding integrated circuit KD～9561 and switch integrated circuit TWH8778. When working, the KD-9561 outputs the alarm sound signal. After the TWH8778 high current switch integrated circuit is processed and amplified, the speaker is sent to emit a loud alarm. sound. The IC uses the KD-9561 sound IC, and can also use the KD-9562 sound IC to wire the alarm sound signal according to the requirements. IC2 selects TWH8778 switch circuit. When the power supply voltage is 12V, the speaker BL should select 8Ω, 3W speaker or special horn speaker, the current limiting resistor R1 has a resistance value of 300Ω～510Ω, D2 selects 3V voltage regulator tube, D1 is circuit Protection diode, 1N4001 is available. After the circuit is installed, as long as the line is correct, it can be used normally without debugging.
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