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How to turn Smoke alarm into Ultrasonic Dog Repeller

Discussion in 'Audio' started by ArtJ, Sep 26, 2018.

  1. ArtJ

    ArtJ

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    Sep 26, 2018
    I am pretty new to all that stuff.
    So far have experimented with 555 at 10-25kHz, but the dB is too low. Even at 10kHz the output power is pretty low (measured by my Samsung app, OScope at distance 2-4 cm it's just a few dB). I am using a piezo transducer from an old sound system).

    My question : Is it possible to turn an old smoke alarm into a Ultrasonic Dog Replant?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
    2,676
    Jan 21, 2010
    Was the dog planted previously? My gardening experience tells me that you should probably use a bigger pot when you replant it.

    Perhaps you mean repellant?

    Do you know what repels dogs? I don't. When one of our smoke alarms goes off it annoys the heck out of me, but the dogs just ignore it.
     
  3. ArtJ

    ArtJ

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    Sep 26, 2018


    Apologizes. Not Replant. it is REPELANT, Dog Silencer
     
  4. ArtJ

    ArtJ

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    Sep 26, 2018
    Any way that I can edit the title? From Replant. to REPELANT, Dog Silencer
     
  5. ChosunOne

    ChosunOne

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    Jun 20, 2010
    I assume you mean an Ultrasonic Dog Repellent?

    10-25kHz isn't really ultrasonic--most adult humans hear up to 20 KHz, and most kids well into their teens hear up to 25 kHz ( and many of them beyond).

    I seriously doubt that that an old smoke alarm sounder can be modulated to sound in the ultrasonic range. In the USA, the high-pitched piezo sounders (as opposed to the older raucous buzzers) sound a lot like a Mallory SC628 Sonalert piezo sounder that operates at 2.9 kHz. Given that (as I understand it), that frequency is governed by a crystal integral to the sounder, I doubt it can be boosted up into the U/S range.

    EDIT: Sorry, I didn't see your corrective post before I posted.
    And an ultrasonic dog repellent is likely not to be a dog silencer--I suspect that dogs that have to endure it (i.e., can't escape it) might be noisy in their protests.
     
  6. ArtJ

    ArtJ

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    Sep 26, 2018
    Hm, it doesn't sound promising.
    Any chance of replacing the whole sounder with a small piezo (80 dB) I guess the impedance will be pretty similar so the amp wont struggle with the capacitive load?
    Then uplifting the output frequency to 25 kHz ( the best freq to silence dogs)?
     
  7. Bluejets

    Bluejets

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    Oct 5, 2014
    I don't know........our cat took one look and disappeared for 2 days the last time my burglar alarm went off(same sound) ...last I saw him he was about 300m away taking a look back to see what the hell was that//

    Guess I should add in fairness, he was in a deep sleep in the middle of the day at the time :)

    Then again, dogs seem to have attitude and you're likely that the response will be he don't give a fug.

    I have seen where old smokies are hacked ( fairly simple) for use as water level alarms.
     
  8. Audioguru

    Audioguru

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    550
    Sep 24, 2016
    A piezo transducer is made to produce audible beeps, not ultrasonics.
     
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