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Drive a Piezo Buzzer

Discussion in 'General Electronics Discussion' started by CatCat, Sep 23, 2016.

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  1. CatCat


    Sep 23, 2016

    I am integrating a piezo sounder into my project. As for now, I have one of the digital output pins directly connected to the piezo. It works, kind of. Like I can hear it. barely. It's a 12v transducer and obviously it is under-powered. I do have 12v power supply so the question is not how to add a step-up. The question is how to commutate 12v with 3v?

    It is a n00b question, but it is my first project that actually involves not only programming and connecting components but actually soldering:)

    I googled and read this forum and it seems I need a mosfet. But exactly which one? 2N7000 looks like the cheapest one, will it work???

    Also, there are a couple of post mentioning it worth adding an inductor into the circuit to increase the output from the transducer. Which inductor? Where??

    If anybody could draw me a circuit, I would really appreciate it.

    Thank you,
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    This link shows what to do. You can use a MOSFET of a bipolar transistor, in this application it won't matter from the point of funtionality. But MOSFETs need a different control scheme than bipolar transistors do.

    What kind of buzzer (link to datahseet?) do you have?
    • with integrated driver (just apply 12 V and the buzzer sounds)
    • without driver (buzzer requires AC control to emit sound)?
    You'll need different technologies to drive either type.
    CatCat likes this.
  3. 73's de Edd

    73's de Edd

    Aug 21, 2015
    Mme Ann . . . . .

    TRY THIS ONE . . . .

    Velly-velly cheeeeep . . . . . by using scrounged parts . . . . . and Universal.

    Voilà . . . . Le Schéma . . . .

    Piezo Driver Circuit.png

    73's de Edd
    Last edited by a moderator: Sep 23, 2016
    CatCat likes this.
  4. CatCat


    Sep 23, 2016
    Guys, thank you very much!!!
    I appreciate this!
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