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Why ultrasonic transducer pair is costly?

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what transducers are you referring to? not all transducers are costly... there are low cost transducers used in many application like medical and industrial..
 

what transducers are you referring to? not all transducers are costly... there are low cost transducers used in many application like medical and industrial..

I mean the transducers used in projects like ultrasonic range finder, ultrasonic obstacle detector etc... I came to know that those pair cost around 500 INR.
 

I think you can find them in lower price.
A quick search in ebay showed transmitter/receiver pairs like this for about $5 US
ultrasonic1.jpg


or some which include a driving circuit as well for about $7-9 US
ultrasonic2.jpg

Alex
 

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