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waterproof microphone

Discussion in 'Electronic Design' started by Eugen Artus, Nov 17, 2008.

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  1. Eugen Artus

    Eugen Artus Guest

    Hi!

    I'm designing a portable device containing a microphone. As this device is
    to be used outdoors (field work), it should be waterproof (at least rain
    proof). What possibilities exist to mount the microphone protected from
    water? I already considered special waterproof microphones (e.g. KNOWLES
    ACOUSTICS MR and WP series) or using a waterproof speaker as a microphone
    (sound quality doesn't matter as the instrument merely registers the peak
    volume), but maybe there is a simpler (and cheaper and smaller) solution...
    Ok, putting the whole thing in a plastic bag may be simple and cheap, but
    I'm looking for something which is more "professional" ;-)

    Thanks!

    Eugen
     
  2. Eugen Artus

    Eugen Artus Guest

    Hm, ok, putting a condom over it may work, but is roughly the same category
    as the plastic bag - it's not really appropriate for a device which will be
    produced in (small) series. I would also doubt the durability of the condom
    (UV radiation...).

    Eugen
     
  3. Eeyore

    Eeyore Guest

    Condoms have been known to be used. for this purpose ! Do you want this to be
    statically located for some time ?

    Graham
     
  4. ian field

    ian field Guest

    Clingfilm and a rubber band is probably cheaper and absorbs less of the
    soundwaves.
     
  5. Guest

    What a coincidence, my lab is developing microphone-proof water as we
    speak.
     
  6. Alan Peake

    Alan Peake Guest

    Eugen Artus wrote:
    ..

    What possibilities exist to mount the microphone protected from
    If you just want to know that there is a signal, try a hydrophone.

    Alan
     
  7. ian field

    ian field Guest

    Can you get echo by pitting the mic inside an inflated condom?
     
  8. default

    default Guest

    How about the standard electret mic in an aluminum capsule . . . take
    a sheet of some flat light plastic like polyethylene or mylar film and
    super glue it to the front then cut away the excess around the face.
    On the connection terminal side solder wires on, paint with a high
    quality oil based varnish, then shrink fit sleeves over the
    connections.

    With a little care it would hardly be any different than the standard
    electret capsule. Buy an electret already mounted in a holder and
    water proof each one.
     
  9. Eeyore

    Eeyore Guest

    You're probably right but as it's field work it's likely to rustle I suspect.

    A Rycote windshield may do the job adequately as long as it's not for a long
    period.
    http://www.rycote.com/

    Graham

    Suggest also ask in rec.audio.pro and/or alt.audio.pro.live-sound
     
  10. Eeyore

    Eeyore Guest

    I think the distance is too small. Might make a nice comb filter though.

    Graham
     
  11. Eeyore

    Eeyore Guest

    Well it probably was a tube based condensor mic.

    Graham
     
  12. Eeyore

    Eeyore Guest

    Electrovoice used to make genuine waterproof speakers for continuous outdoor
    use if that helps. Doubt they do any more though sadly but you never know.

    Graham
     
  13. ian field

    ian field Guest

    Would filling the rubber johnny with helium make any difference?
     
  14. K Ludger

    K Ludger Guest

    only with the extra large sizes ones.
     
  15. Phil Allison

    Phil Allison Guest

    "Eugen Artus"

    ** What you are asking for may be impossible.

    All depends on what sort of SPLs are actually trying to measure.

    Cos a mic exposed to rain and wind is gonna make a lot of noise you do not
    want.


    ...... Phil
     
  16. By the time you had retrieved it from the ceiling, you would be too
    tired to use it.
     
  17. Guest

    Make a laser mic, its not hard and it doesn't matter if the beam gets
    wet.
     
  18. K Ludger

    K Ludger Guest

    In surgical theatres things from microscopes to joy sticks to microphones
    are routinely covered with plastic bag covers - maybe see what they use and
    buy them.
     
  19. ian field

    ian field Guest

    If you fill the johnny with enough helium to lift the mic you can tether it
    at the right height with the mic cable.
     
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