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Voice electronic doorbell circuit diagram

2014-11-28 23:53  
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Voice electronic doorbell circuit diagram
The circuit consists of integrated circuit IC, resistor R, capacitors C1, C2 and button SB, speaker BL, power supply and other components. When people press the doorbell button SB, IC is triggered to work. The memory voice signal is amplified by the transistor to promote the speaker and emit loud voice. C1 is used to eliminate the noise signal sensed by SB long lead.