beef-up an "ultrasonic" amplifier

Discussion in 'Electronic Design' started by Dave, May 5, 2004.

  1. Dave

    Dave Guest

    I have a cheapo ultrasonic pest repeller thing that's just an osc/amp + small
    speaker. What I'd like to do is remove the speaker and feed the signal into a
    more powerful amp then use that to drive a tweeter. The freq. is about 25-30kHz.
    Has someone got a *simple) circuit I can use to do this please? I only have a
    multimeter (no 'scope) so I can't see if it's working. I don't want to build the
    osc. from scratch because, as I say, I have no 'scope to see it's actually
    working.
    tia
     
    Dave, May 5, 2004
    #1
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  2. Dave

    Joerg Guest

    Hi Dave,

    Please mind dogs, pets and wildlife in your neighborhood. They can often hear this
    range and to them it may sound like a car alarm constantly running in your living
    room would to you.

    Regards, Joerg
     
    Joerg, May 5, 2004
    #2
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  3. Dave

    Ron Hubbard Guest

    "Dave" <> wrote in message
    news:...
    > I have a cheapo ultrasonic pest repeller thing that's just an

    osc/amp + small
    > speaker. What I'd like to do is remove the speaker and feed the

    signal into a
    > more powerful amp then use that to drive a tweeter. The freq. is

    about 25-30kHz.
    > Has someone got a *simple) circuit I can use to do this please?

    I only have a
    > multimeter (no 'scope) so I can't see if it's working. I don't

    want to build the
    > osc. from scratch because, as I say, I have no 'scope to see

    it's actually
    > working.
    > tia


    Dave, you might try connecting the output of your pest repellor
    into the input of a LM384 amplifier. That should give you several
    watts of acoustic power.

    Ron
     
    Ron Hubbard, May 6, 2004
    #3
  4. Dave <> wrote:

    >I have a cheapo ultrasonic pest repeller thing that's just an osc/amp + small
    >speaker. What I'd like to do is remove the speaker and feed the signal into a
    >more powerful amp then use that to drive a tweeter. The freq. is about 25-30kHz.
    >Has someone got a *simple) circuit I can use to do this please? I only have a
    >multimeter (no 'scope) so I can't see if it's working. I don't want to build the
    >osc. from scratch because, as I say, I have no 'scope to see it's actually
    >working.
    >tia


    See this recent thread.

    To: Newsgroups: sci.electronics.basics
    Subject: Re: Need ultrasonic sound
    Date: Wed, 28 Apr 2004 14:12:13 +0100
    Message-ID: <>

    The 'Dazer' I mentioned has now arrived. It's very small and powered
    by a single 9V PP3. So, assuming it really is effective (and there are
    many apparently genuine endorsements), I'm guessing that the
    significant difference to my DIY design (18V, and rather larger piezo)
    is as Soeren implied, namely the need for an inductor to get
    resonance.

    I'll open it up soon and report back. But I anticipate still needing
    an answer to a question to which I've so far seen no thorough reply:
    how to *measure* the output power? (Or calculate it reliably.)

    --
    Terry Pinnell
    Hobbyist, West Sussex, UK
     
    Terry Pinnell, May 6, 2004
    #4
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