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Date Posted: 22:09:51 10/22/12 Mon
Author: d
Subject: earphone

howto make an earphone 16
Posted By: Offline

* nclexchat4
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Tue Mar 4, 2008 3:38 pm |


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Building your own earphones
You can build your own earphones using a tin can, a nail, a small
magnet, and some fine wire. Wind a few hundred turns of wire around
the nail. Let the magnet stick to the head of the nail (a neodymium-
iron-boron supermagnet in our catalog works well here, since it is
strong and very small). Attach the coil to the radio in place of the
earphones. Hold the open end of the tin can to your ear, and hold the
nail very close to the bottom of the tin can. The bottom of the can
will be attracted to the magnet, but the coil will make it vibrate
with the sound from the radio.
A coil from an old relay or solenoid will often also work, and save
you the effort of winding the wire on the nail.


A seashell loudspeaker
I got a large conch shell from an aquarium store for a few dollars.
Using a concrete drill, I made a 1/4 inch hole in the shell at the
small end (where the shell was formed when the conch was very small).
I then glued a piezo-electric earphone to the hole. This makes a nice
trumpet-like megaphone and makes the sound of the radio clearly
audible across a quiet room. It also looks very nice.
--------------
-copied

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