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BOOSTXL-TUSS4470: I have the same problem, but apparently didn't quite understand the solution.

Part Number: BOOSTXL-TUSS4470

Hello, I have the same setup as John Curry, but I think don't quite understand the solution as mine still outputs no visible peaks. I have imported the provided configuration file and wired everything according to my understanding. The only thing I didn't do is use a proper tank. I have just put the transducer under a cup full of water with no glue or anything. I hoped I could at least see something. This is my config and how it looks when under the cup. 

This is the current setup and wiring

The resistor is 10 Ohm.

(The bottom two shunts weren't there in the time of measurement)

 

This is how my shunts are:

  • Hello David,

    Thank you for your question. I believe the reason why you are not seeing any return echoes is because the transducer is not properly mounted to the bottom of the cup. You need a very good mechanical connection with no air gaps in order for the ultrasonic signal to propagate through the cup as needed. Please follow the instructions in this app note and they should help you create that good connection. Additionally, for liquid applications you typically want to use a transducer in the MHz range because they provide better resolution, there is also info in the app note about transducer frequency selection.

    Best,

    Isaac

  • I will try mounting it properly in the following days. And when you look at the photos, do you think I have the shunts and the 10Ohm resistor placed correctly?

  • Hello David,

    The is the 100ohm meant to be a dampening resistor to reduce the ringing on the transducer? Typically at first I would suggest that you try it without one to see if you are getting favorable results if you feel like you need to improve the ringing decay then we suggest using a pot in parallel so that you may find what value works best with your transducer. But it might be best to solder the resistor instead of inserting into the slot that way it is possible it might not be making a proper connection this way.

    For the capacitor shunts you actually need to calculate the amount of capacitance needed based on your transducer frequency.

    You can find these in table 20 of the datasheet. I suggest starting with the suggested values and then fine tuning by either increasing or decreasing until you get a desirable waveform.

    Best,

    Isaac