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ultrasonic sensor,filtering frequencies

I want to use 40kHz ultrasonic sensors
but I dont know how to filter other frequencies and save 40kHz,


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very interesting.

so you have applied op-amp in case of filtering.

not RLC filter,

dude,I promise to improve myself very soon to ask much better questions.

but thanx for answering my questions

The reciever is most responsive to 40KHz. Filtering is a complex subject with a lot of math involved. If you want to make your own  sonar then you can copy my design.