555 alarm doorbell and lighting controller circuit

  
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As the figure 15-24 shows, the controller circuit is composed of the switch type Hall integrated circuit DN838 and the astable multivibrator (composed of the 555), this circuit can be used in wide range of applications such as the automatic door opening, automatic delay alarm, automatically turns off the lights and also it can be used as the doorbell. The a..
555 alarm doorbell and lighting controller circuit - schematic




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