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piezo and uP

Discussion in 'Electronic Design' started by [email protected], May 26, 2006.

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  1. Guest

    Hi all!

    Could someone tell me how to make a piezo louder?
    I did connect it directly to uP PIN and to ground, only 5V is avail in
    circuit.
    also I woundn`t like to use externel ICs such MAX232 to imprve voltage
    over piezo.
    I have got square wave with piezo`s resonate freq.


    any ideas?

    besr regards
    david
     
  2. Pooh Bear

    Pooh Bear Guest

    Drive one pin with the uP and connect the other pin to an inverted version of
    the same signal. I hope you have a spare inverter handy. It'll double the volts.

    Graham
     
  3. Homework problem?



    Best regards,
    Spehro Pefhany
     
  4. On 26 May 2006 04:33:14 -0700, in sci.electronics.design
    Put a small tube on it, it will "amplify it". Adjust the length of
    the tube for maximum sound


    martin
     
  5. Guest

    i have got tube, i do alsa connect it with NPN key and the inductor
    across the piezo but it is still not lout enough any more ideas ?
     
  6. Or design a tuned (eg. Helmholtz) cavity.


    Best regards,
    Spehro Pefhany
     
  7. Quack

    Quack Guest

    connect the uP PIN to a transistor to switch the power (5v) through the
    piezo.

    The uP PIN is probably only capable of driving a few Ma.

    Alex.
     
  8. Guest

    it is capaple to rive bout 20ma, itis connected via transistir...but
    still not loud enough...
     
  9. Drive a push-pull step-up transformer with, oh, 100mA or 200mA, then.


    Best regards,
    Spehro Pefhany
     
  10. Sjouke Burry

    Sjouke Burry Guest

    Connect it to two inverted outputs,it doubles
    the voltage.
     
  11. Pooh Bear

    Pooh Bear Guest

    12AX7 ? ;-)

    Graham
     
  12. Pooh Bear

    Pooh Bear Guest

    I think you mean connect it to the output and an inverted output ! ;-)

    Graham
     
  13. Ken Smith

    Ken Smith Guest


    Try using a different piezo. The quality varies a fair bit from brand to
    brand. In general the larger ones are louder.

    Place the device as it will be in the final product and hook a generator
    up to it and find the loudest point. This may be far from the makers
    published resonant frequency number, depending on the mounting.

    Drive the device with a discordant sound. They always sound louder and
    get more attention.
     
  14. Slavek

    Slavek Guest

    Connect parallel piezo with inductor. Calculate inductance for
    resonanse at the maximum laoudnes of piezo. Use driver with overvoltage
    and other protections.
     
  15. Dirk Bruere

    Dirk Bruere Guest

    Called a "Helmholz resonator"

    Dirk
     
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