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Powerful Ultrasonic Speaker Needed

Discussion in 'Electronic Design' started by [email protected], Oct 21, 2005.

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  1. Guest

    I have an ultrasonic device to stop a neighbors dog from barking.
    Unfortunately the yards are large and the device is not powerful
    enough. I need a really powerful ultrasonic speaker. The ultrasonic
    sound needs to broadcast frequencies too high for humans to hear but
    dogs must be able to hear it. Can anyone recommended a powerful
    ultrasonic speaker system?
     
  2. Phil Hobbs

    Phil Hobbs Guest


    Smith & Wessons produce nice loud wide-spectrum acoustic pulses,
    including lots of ultrasound. They are also very effective for stopping
    dogs barking, but in some localities they may have certain
    disadvantages, such as getting you put in jail, or stimulating acoustic
    emission from other nearby Smith & Wessons.

    If those disadvantages don't appeal to you, and speaking to the
    neighbour doesn't work, call the cops each time the dog barks for more
    than a few minutes.

    Cheers,

    Phil Hobbs
     
  3. Jim Thompson

    Jim Thompson Guest

    Yesterday, an armed robber and his girl friend found out not to
    attempt an armed robbery in Mesa, AZ.

    Man shot dead and girlfriend wounded three times by store owner ;-)

    ...Jim Thompson
     
  4. My 686 barks louder than any dog.
    The store owner needs to practice gun control.
     
  5. Jim Thompson

    Jim Thompson Guest

    I presume you mean his marksmanship? It should have been TWO dead ;-)

    ...Jim Thompson
     
  6. Record the dog barking and play it back through a loud amplifier on a
    timeswitch when you are out for the night but you know your neighbour
    will be in.

    Then offer to sell him the device so the he can stop his own dog from
    barking in future.




    Then run....
     
  7. wrote...
    It may make the dog bark more. UDT sells ultrasonic
    transducers for use in air, but I doubt you'll be able
    to create very high sound levels. http://www.udt.com/
     
  8. Gun control *is* hitting your target. The shop owner only did a
    half-assed job of cleaning the gene pool. ;-)
     
  9. GregS

    GregS Guest


    There was just a news report here of a fellow using antifreeze, he just
    got 3 years probation.

    greg
     
  10. Al

    Al Guest

    When I lived in Montana, the secondary charge for a drunk would be
    carrying a loaded weapon within city limits. I think it was a
    misdemeanor. At any rate, even though there were a lot bar fights when
    the cowboys came to town, nobody EVER drew a gun.

    Al
     
  11. What a silly law. I can understand "shooting under the influence"
    being a no-no, but this is silly. Even a properly registered[*]
    gun can't be taken into the city? Did they have a gun-check stand
    at the city limits?

    [*] Another silly idea.
    Never take a gun to a cowboy fight? ;-)
     
  12. Phil Hobbs

    Phil Hobbs Guest

    I can see that. It's sweet-tasting to people, too, and leaving a dish
    out where a child might run across it is definitely A Stupid Move.

    On the other hand, some dogs have been known to die from being fed
    chocolate. It'd be hard to nail someone for putting 10 Hershey bars in
    your front yard.

    Cheers,

    Phil Hobbs
     
  13. Jim Thompson

    Jim Thompson Guest

    My oldest son says Crossman CO2 pistols are very effective ;-)

    ...Jim Thompson
     
  14. Guest

    Save your money, dogs also howl in pain, when stimulated with loud
    noises. Best to play back the puppies bark with a small time delay, in
    the audible range, say 30 milliseconds, so it gets confused. Otherwise
    your wasting your time.

    Some other poster came up with that idea a year ago and it works well,
    we tested it in humans :)

    When we have parades in our township with fire trucks lined up for a
    half mile, howling is inevitable for all dogs within several miles,
    discreet ultrasound from the older air driven sirens is what the dogs
    are protesting about!

    Steve Roberts
     
  15. Don Foreman

    Don Foreman Guest

    Directionality can be as important as power for longer distances,
    since the R^^2 law is operative. A small satellite dish (like
    DirecTV) could be very effective here for two reasons:

    * with lambda of about 1.5 cm at 22 KHz, the sonic halfpower beamwidth
    is quite small -- and the directional gain is > 30 dB

    * it could be fairly clandestine, because it's hard to tell by looking
    where an offset-fed paraboloid like that is really aimed.

    Powerful source of ultrasound: if you have compressed air, google on
    Hartmann Whistle. One of these made for 22 KHz would be about the
    size of a kid's crayon, produces well over 100 dB SPL. One can be
    made on a lathe in half an hour.

    The idea here is not to injure the dog, but to train it. Responding
    blip for yap is not malicious or agressive behavior on your part.
    Owners are often not there when dogs bark, which is sometimes why they
    bark: they're lonesome. Even if they are there, some don't care
    while others are clueless on how to train a dog and require certain
    manners.

    Just give it a blip per bark until it lears to associate a moment of
    OW with each yap. (Doesn't seem loud when I bark, but that echo
    sure smarts!") Some dogs learn quicker than others, most will
    "get it" eventually.
     

  16. You could end up with a bunch of overweight chocolate lovers fighting
    in your yard if you aren't careful! ;-)
     
  17. Mike Young

    Mike Young Guest

    What more can you tell me about that? Is it just folklore, or is there more
    to it? My lab howls along with fire sirens and the large pole mounted one at
    the school, every Tuesday at 10:00 AM when they test it, but not the police
    electronic ones. No other dog I've known did that, nor do the neighbors'
    dogs. (It's more of a low, quiet karaoke than a bay or wolf howl, somewhat
    endearing until I read what you wrote. Maybe I'm just not hearing the
    ultrasonics.)
     
  18. Guest

    Now there's a germ of an idea! There are dog training whistles that are
    just ordinary whistles that are built to resonate in the ultrasonic range just
    above human limits.

    Why not make one of those and power it from an air compressor? I think
    you could get a lot more power from that than any simple electronic speaker.

    Jim
     
  19. Don Foreman

    Don Foreman Guest

    Mechanical sirens are much richer in harmonics than electronic
    sirens that use loudspeakers.

    An ordinary dog whistle doesn't work any better with more pressure.

    Google on Hartmann whistle. These operate on a different principle
    than dog whistles, but they but are no bigger or more complex and
    they can produce some serious ultrasound power using compressed air.
    They've been used for popping bubbles, as in controlling foam in
    chemical processes, and atomizing liquids with ultrasound. They are
    a small enough source to be easily collimated into a narrow beam with
    a fairly small reflector -- as, e.g., a DirecTV dish.

    This would not be a "here, Rover" whistle. SPL at 50 meters would be
    well above the threshold of pain.
     
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