Instructables
Picture of Backpack Stereo
This mod is a fairly easy mod to put a pair of speakers in your backpack. you will need to know how to solder, sew, and you will need some common sence
 
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Step 1: Requirements

List of items:
a pair of computer speakers with input voltage of around 9 volts DC(check the output on the ac adapter)
Soldering station and solder
Wire
Backpack
Needle and thread
NiCD or NiMH battery pack to match voltage of speakers
battery charger
molex plug with input plug or plug set of your choice
3.5 mm headphone jack input
3.5 mm cable
Altoids tin
hot glue and hot glue gun
knife or other cutting tool

Optional:
bigger/better speakers to upgrade to ; )

Step 2: Taking it all apart

first off your going to need to open up the computer speakers to reveal the control board along with two speakers and a headphone cord to plug into an ipod.
once this is all done your going to either cut the power wire or unsolder the power input checking to make sure your know positive from negative.
hold onto that as you will turn it into a power supply for it when our battery is dead.

next your will either cut or unsolder the wire's going to the speakers so they can be placed correctly and have the cables extended. again make noe of positive and negative.

Step 3: Headphone jack

now from you headphone cable you will get 3 or 4 wires when it is cut and stripped, white will be left positive, red will be right positive, and black or no casing will be ground, if you have 2 grounds twist them together. now your will solder your headphone jack o these wires accordingly, 1 will be ground, 3 will be left and 2 will be right (number on the diagram). solder these to the correct points and leave that be.
Vijster13 years ago
http://www.instructables.com/id/MP3-Back-Pack-Speakers/
jg-stah3 years ago
how much would this cost
Jedrokivich3 years ago
lol "common sence"
gelvenchief3 years ago
i like this idea a lot but I have been trying to find a way to have a more advanced sound system in a bag. The places that i would be using the speakers are loud enough that just regular computer speakers wouldn't be loud enough. any ideas?
MJTH5 years ago
Is it possible to OVER charge?
zim0909 MJTH5 years ago
if your talking about batteries then definitely. There are many things that influence how long to charge batteries for but for a general rule, stop charging if the battery gets warm. P.S. don't leave batteries charging unattended
that's cool, G. Now I can be even more annoying!
Solder them to what?
I'm sorry; this step is a little unclear to me and I had a few questions. I'm using a set of computer speakers and I've opened them up. The "main" speaker has a cord coming out that connects to the computer. Do I just cut off the connector at the end and strip the wire? And um...WHAT exactly do I solder the wires to? (Noobish person over here! XD)