Recordable electronic doorbell

  
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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 mo..
Recordable electronic doorbell - schematic



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