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piezo transducer; polarity; current

Discussion in 'Electronic Basics' started by Adam Funk, Mar 21, 2012.

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  1. Adam Funk

    Adam Funk Guest

    I've been playing with a piezo transducer in 556 circuits (at higher
    frequencies than with LEDs). The one I'm using is KPE-163, and the
    specification says:

    Rated Voltage (Vp-p) Max 30
    Current Consumption (mA) Max. 10 @10Vp-p, square wave, 4.8Hz

    and it has two leads: one black and one red.


    I was wondering whether it would work in a double-555 multivibrator
    (powered by a 9V battery) described as having push-pull output, and it
    does (I think I had some resistance in series just to be careful). So
    I wondered whether the implied polarity in the lead colors was
    significant.

    AFAICT from trying it turned both ways in a single-555 multivibrator
    (between the ground and 9V square wave output), I suspect it isn't
    actually polarized. Comments?

    Also, does the specification mean that the actual current when you
    apply 10Vp-p voltage is 10 mA, so (unlike LEDs, for example) it
    doesn't need any protective series resistance at that voltage?


    (I have 5 of these and they were cheap, so I don't mind burning a
    couple out for educational purposes.)
     
  2. Phil Allison

    Phil Allison Guest

    "Adam Funk"
    ** That is a piezo buzzer - it has an electronic circuit that makes the
    beep.


    ** Beep, beep beep beep .....
     
  3. Jasen Betts

    Jasen Betts Guest

    is it this one?
    http://www.datasheets.org.uk/indexdl/Datasheet-077/DSAE0052603.pdf
    another reason to colour the leads is that if you have two and want the
    both to be in phase you can match the leads up
    Phil H says thet y can be damaged by prolonged exposue to reverse
    polarity. Phil A seems to have the part confused with a different part.
    that's right. it doesn't need any. these devices behave like lossy
    capacitors each time they get a voltage change they will only accept a
    small amount of charge
    with the 556 you can make a louder noise by using a bridged
    configuration:

    . . . . . . . .
    .O . . .
    [. . . .]--+
    . . |
    . . |
    +--------[. .] |
    C1 | . . |
    || | . . |
    +--||--+ [. 556 .]-----+
    | || | . . | |
    | | . . | |
    | +-----------[. .] | |
    | | | . . | |
    | | +-[R1]-+ . . | +-----
    | | | +-[. .]--+ |
    | | | | . . | | to piezo
    | | | | . . | |
    | | +------|-[. .]-----------
    | | | . . | |
    | | | . . | |
    +---------------[. .]--|--+
    | | | . . | |
    | | | . . . . . . . . | |
    | | | | |
    | | +--------------------|--+
    | | |
    o o------------------------------+
    - +
    9V battery

    or you can produce a varying tone by driving the CV pin
    of the cecond astable from the first.

    +---------------------------------.
    | |
    |+ . . . . . . . . |
    ===== .O . . . |
    | C1 [. . . .]---+ |
    | . . | |
    | . . | |
    +--------[. .] | |
    | . . | |
    | . . | |
    | [. 556 .]-----+ |
    | . . | | |
    | . . | | |
    +-----------[. .]--------+
    | | . . | |
    | | . . | |
    | +--[R1]--[. .]--+ |
    | | . . | |
    | | . . | |
    | +--------[. .]--------------+
    | . . | | |
    | . . | | |
    +---------------[. .]--|--+-+-[R2]-+--- +
    | | . . | |
    | | . . . . . . . . | ===== to piezo
    | | | C2 |
    | +------------------------------+ +-----------
    | | |
    +---------------------------------------+
    | |
    o o
    - +
    9V battery

    R1 47K
    C1 10uF
    R2 3.3K
    C2 10nF

    I expect that will make a horrible racket.
     
  4. Phil Allison

    Phil Allison Guest

    "John Fields"
    "Phil Allison"

    ** See the OP's post.

    " Current Consumption (mA) Max. 10 @10Vp-p, square wave, 4.8Hz "

    That error PLUS the pic and description fitted an electronic buzzer.




    ..... Phil
     
  5. Adam Funk

    Adam Funk Guest

    I think so. The data sheet I have is only in English and just has the
    information corresponding to parts B, C, & D in that example.
    Oh, that's given me an interesting idea to play with.


    Thanks for the other information and suggestions!
     
  6. Adam Funk

    Adam Funk Guest

    Interesting, thanks.
     
  7. Adam Funk

    Adam Funk Guest

  8. Phil Allison

    Phil Allison Guest

    "John Fields"
    "Phil Allison"
    ** Irrelevant.

    Your link was not available to me.

    I found a pic and an ambiguous description.

    Did you SEE the error in the OP's post at all ??



    ...... Phil
     
  9. Adam Funk

    Adam Funk Guest

    What was my error? (The RS website calls it a "Piezo electric
    transducer", and the specs were all copied & pasted from the data
    sheet.)
     
  10. ehsjr

    ehsjr Guest

    There's a difference in the specs between the datasheet at
    the link John Fields posted and the spec you posted:
    Your post says "square wave, 4.8Hz"
    Datasheet says "square wave, 4.8KHz"

    Ed
     
  11. Adam Funk

    Adam Funk Guest

    Oops, I just checked the PDF I have from RS, and it must just be a
    scan: the text is not copy-and-pastable.

    Aha, that's my typing error; the PDF I have does actually say
    "4.8KHz". You're right.
     
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