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One of the "ding dong" sound electronic doorbell circuits
Source: InternetPublisher:newlandmark Keywords: Doorbell circuit electronic doorbell BSP integrated circuit Updated: 2021/07/09
It uses KD156 integrated circuit with lingering "ding dong" sounds and bird calls .
In the picture, SBi and SBz are doorbell buttons. If SBi is installed in the bright place and SBz is installed in the dark, you can distinguish who is coming based on the different doorbell sounds
(a "ding dong" sound and a bird chirping sound).
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