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Ultrasonic Transmitter and Receiver

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ginebra

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Hi Good Day!

I bought a 40Khz Ultrasonic Transmitter and Receiver for the 1st time and I am hesitant to use it because I dont know if it has a certain polarity or if what I bought was the non-polarized type. Also I would like to ask if since its center frequency is 40 Khz does it require its input to be 40 kHz as well or for any frequency, it would emit at 40 khz?

Here is the datasheet from the buyer.
 

FvM

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There are no polarized and non-polarized transducers. All have (or should have) a polarity marking relating input voltage
to sound pressure polarity. It's meaningless in most applications.

The sensor's datasheet is somewhat incomplete. Do you expect to get the missing information from edaboard users?

But fortunately, these 40 kHz sensors have more or less similar data, you can refer e.g. to Murata MA40xx parts to see
some data of typical transducers. Hopefully it helps in understanding their basic operation.

If you have an application, that you want to implement with these transducers (e.g. rangefinder, motion detector whatsoever),
just try. A circuit that works with other parts should do with these as well.
 

ginebra

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its just that the datasheet provided was somewhat limited and I only have 1 each of the transmitter and receiver such that I cant afford to damage them. but if you say that there is no polarity I would just ignore my doubts about that matter. Thanks for the reply.

Um sir does the 40 khz transmitter require that its input also have a frequency if 40 khz?
 

betwixt

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These devices are highly resonant. Yes you should feed 40KHz in to the transmitter and you will see only 40KHz plus a narrow band each side of it at the output of the receiver.

Brian.
 

FvM

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does the 40 khz transmitter require that its input also have a frequency if 40 khz?
Although it's limited, the datasheet answers at least this question: It reports a transducer bandwidth. You can either use a
fixed frequency of 40 kHz or make your circuit tunable for a few kHz arround 40 kHz.
 

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