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Percussion electronic doorbell 1

2014-11-02 08:04  
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Percussion electronic doorbell 1
The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit consists of piezoelectric ceramic BC, amplification tube Vl, resistors Rl and R2 and capacitor Cl and so on. Monostable trigger circuit is composed of the D flip-flop which is inside of the dual D flip-flop IC and the external components. Pulse counter circuit is composed of decimal pulse counter integrated circuit IC2. Music generating circuit is composed of the music IC IC3 and the external RC components.