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Politely welcoming electronic doorbell

2014-11-22 21:44  
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Politely welcoming electronic doorbell
The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell button S, magnetic switches SA, transistors V4, V5, resistors R3, R4, R6, diodes VD2, VD3, and capacitors Cl, C2. Audio amplifier output circuit consists of transistor V3 and speaker BL. The music circuit consists of music integrated circuit ICl and resistor Rl. Voice circuit is composed of the voice IC lC2 and resistor R5, capacitors C4, C5.