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"Ding dong" electronic doorbell circuit three
Source: InternetPublisher:拳制龙 Keywords: Doorbell circuit electronic doorbell BSP LM324 Updated: 2021/09/03
It is a touch "ding dong" doorbell circuit . When your finger touches the sensor piece, the doorbell will
make three pleasant "ding-dong" sounds.
It uses LM324 operational amplifier Ai and KD153 "ding dong" sound music integrated circuit A2.
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