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Piezo to normal speaker conversion

Discussion in 'Electronic Basics' started by SixteenThirtytwo, Mar 9, 2007.

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  1. I have a device with a built-in piezo speaker, but I'd like to get a
    regular "line out" or normal speaker output from it and see if the
    sound quality improves because of that.
    How do I do that?
  2. Piezo "buzzers" run off of dc. Connecting dc to a speaker will only make a
    click (and later smoke if the dc voltage is high enough).

    Piezo speakers are used for high-frequency sound generation (tweeters).

    Did you mean buzzer or speaker?
  3. jasen

    jasen Guest

    basically you disconnect thr piezo and connect a line out socket in its
    place the details depend on the device

  4. Speaker.
    I have two similar toys where one has a regular 8 Ohm speaker (and a
    headphone jack) and the other one uses a piezo speaker.
    I've managed to get a "Line out" signal by experimenting with various
    resistors, and even managed to remove some of the low frequency
    signals and boost the high frequency ones. It now sounds a little
    "cleaner" and clearer, but is still crap compared to the other toy.
    Perhaps the signal out in itself is bad because the designers didn't
    bother to clean it up as it was just to drive that piezo speaker.
  5. Guest

    Yes, the pietzo is a high voltage - low current device, as opposed
    to a speaker which is a low voltage - high current device. What
    you need is one transistor to boost up your current. You can use
    a simple npn transistor, connect the collector to vcc, base to
    your pietzo, speaker to emitter, other side of speaker to gnd.
    seperate the base from the other stage with a 1uF capacitor,
    connect a trimmer from the base to vcc. Then use the trimmer
    to adjust the emitter dc voltage to be vcc/2. This should give you
    a pritty loud output from an 8ohm speaker.
  6. Not meaning to hijack but are their any issues going the other way. I
    replaced my jukebox tweeters with piezo tweeters. The only reason was in
    trying to find a matching physical size the piezo tweeters were a 1/4 the
    price and new versus taking a gamble with used speakers on ePay.
  7. Bob Masta

    Bob Masta Guest

    Be sure to use the recommended crossover cap, often supplied
    with piezo tweeters. Don't expect the exact same frequency
    response... that's true of all speakers, but especially for tweeters
    because they are run out to their upper frequency limits since there
    is typically no higher-frequency driver, and since almost all speakers
    get flaky at their high end.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!
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