ماوظيفة بوابة NOR في هذه الدائرة ؟؟؟؟؟؟؟



دائرة انذار


Wire Loop Alarm



http://upload.qariya.info/images/qariya-be3549f8f4.gif

This circuit is a simple wire loop alarm that can be used in doorways, hallways, or any other place the tripwire will be broken by intruders. The circuit has a built in siren, but it can be replaced by a relay to drive an external siren, commercial alarm, etc.

مكونات الدائرة
Description Substitutions

R1: 100K 1/2W 1% Resistor
R2, R4: 10K 1/2W 1% Resistor
R3 : 1 Meg 1/2W 1% Resistor
C1, C3 :.1uF Ceramic Disc Capacitor
C2: .01uF Ceramic Disc Capacitor
IC1 : 4001UBE Quad 2-i/p NOR Gate
Q1: MPSA14 Low Power NPN Transistor
SIREN :1 Micro piezo siren 12V DC 150mA, 110dB * 1M
MISC 1 Board, Wire, Socket For IC1