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Simple electronic doorbell circuit
Source: InternetPublisher:失踪的猫 Keywords: Doorbell circuit electronic doorbell piezoelectric ceramics Updated: 2021/12/29
Shown is a simple electronic doorbell circuit , which mainly uses a piezoelectric ceramic sensor BH. The piezoelectric ceramic sensor
is connected to the base circuit of VT1. When it is vibrated by sound waves, it will generate a voltage signal , which will be amplified by VT1 and Vr2, and then drive
the audio circuit KD128. The music signal generated by KD128 drives the speaker to emit music sound through VT3.
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