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Cordless Multidoor Alarm

Cordless Multidoor Alarm

++3758IC3NE55521VccGND64++375821VccGND64++3758IC1NE55521VccGND64+R100KC710μ25VDOOR UNIT IIICIRCUIT ALSO WORKS WITHOUT RD31N4007VR3100KC810μ25VC90.01μS3REEDSWITCHR6330ΩR51KD41N4001DOOR UNIT IIC410μ25VR31KR100KX1LIVE LINEX1 = 230V ACPROMARY TO 12V, 300mASECONDARY TRANSFORMERD21N4007VR2100KR4330ΩS2REEDSWITCHC510μ25VC60.01μD51N4001230V50HZMAINSNLSOC1ELNNEUTRAL LINEEARTH LINE(N.C)DOOR UNIT IC110μ25VR11KR100KC101000μ25VD11N4007VR1100KC210μ25VC30.01μS1REEDSWITCHR2330ΩIC2NE555Cordless Multidoor Alarm
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publish time: 2020-10-23
Circuit Everyday

Through this alarm circuit to detect intrusion to prevent theft attempts.Each door is protected by a separate circuit built around a separate 555 timer IC and a reed switch magnet.All three units are powered by a single power source.The buzzer can be plugged into the ground wire of any socket in any room in the same building with a correct ground wire.No external wiring is required from other rooms to the buzzer unit.

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