🚀 go-pugleaf

In article <182992@pyramid.pyramid.com> rrosen@pyrnova.mis.pyramid.com (Randy Rosenberg) writes:
>I'm not sure if this is the right newsgroup or not, BUT....
>I'm looking for an intercom system to use with my wife so that 
>we can talk to each other while riding my motorcycle.
>Anyway, this is what I am after.  I expect that this will cost on
>the order to $50 to $150 depending upon quality...BUT I can't find
>anything on the market which meets my needs.
>Thanks in advance,
>Randy

  I can suggest something that will cost $10 or so. So it won't fit
with your $50-$150 budget. :-)
 
  Use tubing.  Surgical tubing is hollow, and is flexible, and it is
soft enough that it will pass under the helmet strap. Then use something
like the airplane headphones (those things that they give you to listen
to the movie soundtrack) and hook it up.  It works like a charm. 
You will also be amazed at the directionality and clarity.
  We had to design a microphone system which did not use any contacts ie,
we didn't want anything like batteries and sparks etc.  This was to connect
a person who went down big chemical vats to check them out.  Sparks would
be a big no-no in an explosive gas situation.  We tried sound-powered
walkie-talkie, but the reception was poor at best. The cost for really
good L and C components was too high. Then we hit on the tubing idea.
Worked just great.  Positioning of the tube opening near the mouth is 
important.


-Good luck
Shailendra
ssave@ole.cdac.com