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Inductive electronic doorbell 2

2014-11-12 10:03  
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Inductive electronic doorbell 2
The inductive electronic doorbell circuit is composed of the infrared transmitter, infrared receiver circuit and music generating circuit, ans it is shown in Figure 3-116. Infrared transmitter circuit consists of the time-base integrated circuit lCI, infrared light-emitting diode VL, resistors Rl, R2, capacitors Cl, C2 and potentiometer RP. Infrared receiver circuit consists of the infrared photodiode VDl, resistors R3-R5, capacitors C3-C5 , inductor L and infrared receiving and dealing the integrated circuit IC2. Music generating circuit is composed of the music IC IC3, resistors R6, R7, diode VD2, capacitor C7, transistor V, and the speaker BL.