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    Ultrasonic transducer driver

    Are ultrasonic transducers available with built in circuitry so that only need a DC voltage is needed to operate it?

    How do I consider safety/ear damage, when using one?

    What would be the best way to have an ultrasonic output with variable frequency?

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    Re: Ultrasonic transducer driver

    Hi,

    Maybe you should at least tell:
    * what's the job of the transducer (ultrasonic cleaning, ultrasonic distance measurement, communication, (moving) image detection...)
    * power (voltage, current, impedance)
    * modulation mode
    * frequency (range)
    ...

    Klaus
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  3. #3
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    Re: Ultrasonic transducer driver

    Quote Originally Posted by KlausST View Post
    Hi,

    Maybe you should at least tell:
    * what's the job of the transducer (ultrasonic cleaning, ultrasonic distance measurement, communication, (moving) image detection...)
    * power (voltage, current, impedance)
    * modulation mode
    * frequency (range)
    ...

    Klaus
    No job, just wondering. Can they be purchased with driver circuitry already included so that a DC voltage is all that is required.

    freq range, hmmm how about between 25KHz and 40KHz. perhaps something powerful enough to be felt, if that's possible.

    take this for example
    https://au.element14.com/prowave/400...OPPING-1007357

    110dB, so would that cause hearing damage if it was held against an ear?

    or this
    https://www.aliexpress.com/item/100W...AbTest=ae803_5

    is that dangerous?

    that one was 28Khz, this one is 40Khz
    https://www.aliexpress.com/item/220V...AbTest=ae803_5

    what is the difference in application between 28Khz and 40Khz?
    Last edited by brownt; 8th January 2019 at 08:21.



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    Re: Ultrasonic transducer driver

    Most are designed for a specific purpose and for relatively small markets so I doubt you would find an 'off the shelf' combined driver and transducer except for perhaps 'fish finder' devices for underwater use.

    The frequency depends on the application, ultrasonics is a wide field covering everything from medical to industrial welding, there is no good or bad frequency although for things like plastic welding lower frequencies tend to be used because of the physical resonances of the contact 'horn' have to be considered.

    There is considerable danger with all ultrasonics, just as there is with all energy our senses cannot naturally detect. Think of it like UV, microwave ovens or ionizing radiation, all invisible but capable of serious and permanent injury. In terms of actual loudness, whether perceived or not, 110dB held against your ear is a bit like the sound level standing behind a jet engine.

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    Re: Ultrasonic transducer driver

    I didn't yet came across an ultrasonic application that would take advantage from a transducer with built-in generator. In case of a measurement or communication application, e.g. a range finder, you'll use specific modulation patterns and receiver circuitry synchronized with the generator. Thus the circuit is too complex to be integrated with the transducer. In case of a power transducer like the cleaner linked in post #3, the generator is simply too big.

    The best fit for "ultrasonic transducer with built in circuitry" could be compact distance sensor with built in electronic, like this

    Click image for larger version. 

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