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    Does anyone know how to build an ultrasonic transmitter and receiver?

    For the transmitter I've been using the following circuit:
    http://www.ecelab.com/circuit-ultrasonic-t.jpg

    But not those exact values. However it's still not transmitting!

    and for the receiver I've been using http://www.pages.drexel.edu/~pyc23/u...c_receiver.jpg

    At the end of the receiver I have a motor...that should run regardless if it is receiving a signal or not but if it does receive a signal, the motor should either slow down or speed up.

    Thanks in advance!
 
 
 
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