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HELP NEEDED CIRCUIT FOR ULTRASONIC MOTION DETECTOR

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abated_mars

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Hi ppl...
I want to make an ultrasonic motion detector ..I have acquired 40 khz transducers(RX and TX)..How can i use RX transducer to trigger an alarm when ever a motion is detected..what kind of citrcuit is required to accomplish this task..plizz help me ..I have got one circuit thru Google but i am not able to make out what the OPamps are doing in that Circuit ..
 

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