High loudness alarm generator circuit

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The alarm sound generator circuit is simple, the working performance is stable and reliable, and the working voltage is 6V-12V, which is suitable for use as a siren on automobiles and motorcycles. Component selection: IC uses KD-9561 sound IC, can also use KD-9562 sound IC, wiring according to requirements to make a police alarm signal. 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, DW selects 3V voltage regulator tube, VD is circuit Protection diode, 1N4001 is available.

The high loudness alarm sound generator circuit is mainly composed of the sounding integrated circuit KD～9561 and the switch integrated circuit TWH8778. When working, the KD-9561 outputs the alarm sound signal, and after being amplified by the TWH8778 high current switch integrated circuit, the speaker is pushed to be loud. Alarm sound.