Animal pest repeller

Discussion in 'The Projects Forum' started by prv8eye, May 5, 2009.

  1. prv8eye

    Thread Starter New Member

    May 5, 2009
    I found this old post on another forum
    <<a 38 KHz ultrasonic "BEEP", which humans cannot hear, using a signal generator and a piezo horn speaker,>>

    Can someone tell me, in layman's terms, how to build one of these?
    Would it be expensive? Is this stuff I can pick up at Radio Shack?
  2. Darren Holdstock

    Active Member

    Feb 10, 2009
    You can buy these off-the-shelf for much less than it would cost to make one. Either way, they don't seem to work too well with mice in my experience.

    Some models sweep the frequency of the ultrasonic signal, others beep at a fixed pitch.
  3. Audioguru


    Dec 20, 2007
    Who says that animals are repelled by ultrasonic sounds?
    Who says that a cheap garbage piezo horn speaker (used for old guitar bands) has any output at 38kHz?

    I calculated that with high input power the sound level of a piezo speaker at a reasonable distance will be very low.
  4. prv8eye

    Thread Starter New Member

    May 5, 2009
    Not for mice.
    A guy posted on another forum that he had GREAT results with this in getting a rooster to stop crowing.
    I want to set it up so I can operate it by a push button whenever the neighbor's damn bird lets loose.
    Unfortunately the post was a year old and I was unable to contact the author.
    He said it was inaudible to humans but worked very well to silence the bird.
  5. prv8eye

    Thread Starter New Member

    May 5, 2009
  6. HarveyH42

    Active Member

    Jul 22, 2007
    Not sure how smart birds are, but suspect that he hears an unfamiliar sound, and plays it safe. Doesn't want to broadcast his location to a potential predator. Might work for a while, but since there is no real threat associated with the sound, he'll eventually ignore it, just like all the other man-made sounds he's gotten use to over the years.

    Haven't seen piezo beepers with that high a frequency. Hope you are fairly close to the bird, wouldn't expect much range. Could probably throw it at the bird, with greater effect...
  7. Jassper

    Active Member

    Sep 24, 2008
    38Khz? . . . don't you mean 38cal. ? seems like that would be a more permanent fix.