Password electronic doorbell 2

  
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The password electronic doorbell circuit is composed of the trigger circuit and music generating circuit, and it is shown in Figure 3-119. Trigger circuit is composed of the buttons S1-S9, four NAND gate Schmitt trigger integrated circuit IC1 and the external RC components. Music generating circuit is composed of the integrated circuits lC2 and 1C3, transist..
Password electronic doorbell 2 - schematic




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