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PICMICRO --> 1hz speaker

Discussion in 'Electronic Design' started by mark2006, Oct 13, 2006.

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  1. mark2006

    mark2006 Guest

    Hi to all !

    Im looking for shematics on how to connect ( and where to get ) 1 - 15
    HERTZ speaker on picmicro 16F877. The program will generate 1-10 hertz
    but i must be sure that i have made correct hardware connections with
    the speaker.

    btw. where to get such speaker ( for such low freq. ) ?

    Regards,
    Mark
     
  2. scada

    scada Guest

    Who would be able to hear it?
     
  3. Luhan

    Luhan Guest

    I dont know about the speaker, but you could use a cheaper micro
    (PIC10F200).

    Luhan
     
  4. Could you possibly describe what you're wanting to do with this setup? I'll
    assume that you know that 1 - 10hz is inaudible?

    Some speakers can be damaged by this low frequency as the coil inductance
    cannot help limit current.

    Chris
     
  5. You can 'feel' such frequencies (commonly things like feeling your sternum
    pulsing), but you also have to be very careful. Some tones in this area,
    can cause nausea in quite a few people. Normally, an electrically
    controlled tuned Helmholtz resonator is used, rather than a traditional
    'speaker', or a bass reflex system. Few standard transducers will go below
    perhaps 10-15Hz. Even ULF Sonar systems commonly stop at around 18Hz. Few
    transducers will be able to handle the 15:1 frequency range involved here
    (band pass cabinets etc., have a very limited range).
    The poster needs to find a transducer genuinely capable of handling this
    frequency range _first_. No traditional 'speaker' on the market will do
    so. Most will be active systems, with their own drivers, and this will
    effect the signal input required. Seriously, expect to be suprised at the
    price, and power requirements for such a transducer system.
    The lowest frequency normally 'aimed at' for reproduction in a ULF speaker
    system, is the 8Hz, representing the longest orgam pipe used in only the
    very largest organs (most only go down to 16Hz). Also expect to run into
    health and safety regulations at these frequencies. Since you cannot
    'hear' them, and are unaware of the sound levels involved, regulations for
    ULF audio, are usually tight.

    Best Wishes
     
  6. mark2006

    mark2006 Guest

    @Luhan
    Thank you for your suggestion about the chip but i have some 877 left
    from my last design.

    @Roger Hamlett
    Everything that you have described is correct and i am aware of this.
    Im using this for medicine project and in the range of cca 35 cm. You
    are suggesting the transducer. Can you point me where i can get one ?

    As you have written, i will have some problems with defining and
    "hearing" those freq.
    What are you suggesting, what should i do to define those freq. ( with
    hardware ) and is there some option how to see if those freq. are
    correct ?

    Is there some schematisc ... ?

    Mark
     
  7. Rich Grise

    Rich Grise Guest

    Heh! The Brown Noise! It's about 50 or 60 HZ - if it's loud enough, your
    anus resonates, and you can't hold your feces. Butyric acid is the stuff
    that makes you puke. ;-)

    But back to the original question - can you really imagine the transducer
    that could actually put any significant acoustic energy into the air at
    1 Hz?

    I'd think you'd feel it kind of like an annoying, intermittent breeze:
    "Whiff, whuff, whiff, whuff...".

    Cheers!
    Rich
     
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