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PIR. motion sensor alarm circuit

A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit, Q1 and relay it to work and hold for about 20 seconds. to apply to the siren to signal a warning to stop, or discarded by the switch S1 is a switch that controls it. Or a remote control.
PIR. motion sensor alarm circuit

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