Electronic watchdog circuit

  
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Doppler effect sensor Nl (RD627), operational amplifier N2 (LM358), the sound of dogs barking imitation special integrated circuit N3 (KD5608) and other components. When nobody
Electronic watchdog circuit - schematic

in Nl Monitoring area of activity, Nl of feet without signal output, O pin output N2 is low potential, VT cutoff, N3 feet of low potential instead of working. When Nl Monitoring area was activity, which pin outputs a low frequency signal, the signal amplification by N2 after making VT conduction, thus, N3s feet to get a positive trigger signal issued barking. This activity in the region to promote sound Nl Lin as the man to leave the area, and the master alarm. Adjust RP. Nl can change the Monitor distance.




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