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"Ding dong" electronic doorbell circuit 2
Source: InternetPublisher:司马缸砸光 Keywords: Doorbell circuit electronic doorbell BSP integrated circuit Updated: 2021/08/28
It uses KD253 dual-tone "ding-dong" sound integrated circuit .
Each time button SB is pressed, the speaker makes two pleasant "ding dong" sounds. This integrated circuit can prevent
false triggering caused by external interference such as fluorescent lamps and electric bells.
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