Ultrasonic Sound Beam Burglar Alarm
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Ultrasonic Sound Beam Burglar Alarm

N1123N2564N389107N412131114IC1 (N1-N4) = CD4001BR1470KVR122KR222KC10.1μ40KHZTX19-12VC2180PGNDTX1 = 40KHZ ULTRASONIC TRANSMITTERUltrasonic Sound Beam Burglar Alarm
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publish time: 2020-10-21
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This unique anti-theft alarm uses invisible and inaudible ultrasonic waves to detect movement of objects. Ultrasonic transducers can work at the highest efficiency under the frequency of 40kHz. Therefore, this circuit uses an ultrasonic transmitter and receiver operating at 40 kHz to control the buzzer or relay.

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