Introduction.

Nowadays home cinema systems are really expensive for
you, you're not going to buy them, why? just because you can build one of
your own!
It would be an interesting challenge for you.
We're going
to use only PC spare parts (those that you never throw away, just in the
case...)
With an old defective hard disk we can make it, it already has
all the parts we need, a magnet and a coil.
Stereo or mono audio jack
will be also required for an easy connection.
Let's begin building a
speaker.

Building
the speaker box

Take the hard disk and open it, may be you will need a
little torx screwdriver if you don't have it, take the hard tools: the
drill and eat them with it. You are not going to read this hard disk
anymore. We need to get to the hard disk heads, then remove them and get
the coil from inside. You can get the coil from other computer parts
because there's a coil almost everywhere inside a computer, but we also
need a magnet, the most powerful magnet on a computer is in the hard
disk.
Uncoil the coil and coil it again on a pen maker or in your
finger if you don t mind to cut it off or on a 1.5cm cylinder and do 20
full turns around it.
You can test with different diameters and turns
for better results.
The coil is insulated by a thin transparent
plastic, so you will need to burn by using a lighter the beginning and the
end of the coil to remove the insulation.
Now get two floppy disk
labels and put the coil in between, the magnet goes on the top. Join the
wires from the  audio jack with the coil, and it's almost
finished.
Audio jacks can be stereo or mono, three segments on the
connector denotes a stereo jack and two a mono, by now we're going to
build only one speaker box, so if your jack is stereo join right and left
wires together.

Connecting

Now plug the audio jack on your sound card an play
some music it must be working.
They're two kinds of audio outs, those
who are amplified and those you aren't, plugging it on a non amplified
audio jack like the one that is in front of any CD drive the sound is
going to be very low. Sound cards usually have both kind of audio outs,
(green and black, just try).
For better acoustics we can put the
speaker onto the hard disk plastic protection case so it works as an
acoustic box.
Now your speaker box is finished.
Try with other
materials for the box , like aluminum pieces, papers, plastics or whatever
you can imagine.

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