Sound wave experiments

Fri, 26 Jul 2013

This is the project for which I had originally designed the (did I mention award winning?) paper horn. I wanted to experiment with sound playback. I'm working on another couple of projects, more of which later, but I'm also fitting in some experimentation on this sound project. It is non stop at robives.com Towers!

I covered some detail about the sound wave disk in a previous post. I'm now working on a read-head. I made up this box with double thickness walls for rigidity and a sound outlet hole where I'll be attaching the horn.


I've put a couple of stiffening pieces across the underside of the lid. I'm trying to keep things as rigid as possible so any sound energy is not wasted moving the box sides.


The equivalent of a record stylus is made from a piece of card. This is glued to a piece of paper. I used paper so that it moves easily when the stylus is dragged across the wave form disk.


I've glued the stylus to the bottom of the box stretching the paper tight before the glue fully dried.


Finally I've fitted the horn into place.


Next I need to fit everything together so that the stylus runs against the edge of the wave form disk. The closer I get, the more I think that it can't possibly work… A couple of observations: The wave form on an old style vinyl record disk are much smaller than the wave forms on my paper disk. Hand cutting them much smaller than they are is not really a practical proposition. Secondly, even though my intuition says it won't work I can't see any major block to getting it working some how.

Any ideas/comments/feedback?

Comments (3)

  • nanalee July 26, 2013 at 9:10 pm

    Rob,
    ward winning, wow!

    Rob,

    ward winning, wow! Congratulations.

    Nan

  • lunchweek July 26, 2013 at 11:15 pm

    OH-MY-GOD! Rob, that looks

    OH-MY-GOD! Rob, that looks amazing! Congratulations for your award by the way!

  • maxlrainer July 27, 2013 at 3:17 pm

    This looks very good. Another

    This looks very good. Another interesting and related approach to this theme you can find here.

    http://de.opitec.com/opitec-web/articleNumber/805806/ksop
     

    This is the (google) translation of the article information :
    "Pocket Edison Phonograph
    This was a historic moment as it Thomas Edison in 1877 succeeded in mechanically record their own voice and play back. Also, this Pocket Phonograph goes back to one of his patents:
    Four narrow strips on the upper surface fine grooves are embossed, are connected with a resonant body (which may also be a balloon) and played with the thumb nail.
    Heard the following short messages:
    "Happy Birthday","Merry Christmas", "Good Morning" and "Congratulations".
    4 different strip, complete with horns to cut.

     

    I think that Rob's approach is much more sophisticated.

    Rob, you can do it.

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