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本声效IC采用新型号的CMOS制程生产，外用元件极少，直接驱动2LED和蜂鸣器。加三极管推喇叭，可分别控制火警声、救护车声、警车声、机关枪声。按PSK键分别有火警声、救护车声、警车声、机关枪声循环出。