Automated Attendant burglar alarm circuit

It shows an automatic unattended burglar alarm circuit, mainly for family night, warehouses and other occasions automatic unattended. The circuit consists of pyroelectric infrared sensor light control circuit

(RG, RP2, R4), the alarm driving circuit (IC2 and foreign components) , and the like. At higher light intensity during the day, low resistance state photoresistor RG, the transistor is turned on VTI, the alarm circuit shorted: In the night -RG resistance value becomes larger, VT1 off, ready to enter the stage alarm circuit alarm state, when someone enters the pyroelectric infrared sensor probe measured area, ICI foot is triggered, the buzzer alarm.

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