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Recordable electronic doorbell

2014-11-09 19:43  
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Recordable electronic doorbell
The recordable electronic doorbell is composed of the recording and playback integrated circuit IC, resistors Rl-R6, capacitors Cl-C4, microphone BM, speaker BL, control buttons Sl, S2, battery GB and LED VL, and it is shown in Figure 3-123. Rl-RS select 1/4W metal film resistors or carbon film resistors; R6 select the lW metal film resistor. Cl-C4 select monolithic capacitors. VL chooses the φ3mm green light-emitting diode. IC uses the SR9GlOA or ISDll10 audio recording and playback IC. S1 select the miniature moving together button; S2 uses the bell button. BL uses the 0.25W, 8Ω dynamic speaker.