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In this Instructable I will show you how to build an audio amplifier out of mostly recycled parts! To do this project, you should have some experience...
To build your own portable speaker, you need: To make the box: a metal or plastic box big enough to mount your speaker on (I used an old tin box...
First, take the lid from your box and use your rotary cutting tool to cut a hole into the lid, so that the speaker fits right in . Make sure to mark t...
If your speaker can be mounted with bolts, you should drill the holes into the box for them now. After drilling, check to see if you alligned the hole...
If you would like to paint your box, like me, you should first roughen the surface with sandpaper (see pics #5 & #6) and then paint your box, I used s...
For your amp to play anything it must be able to recieve something. So pick a spot on your box and drill a hole for your plug (see pic #2). Before mou...
So that your amp can be turned on and off, you'll need to add a DPDT (double-pole double throw) toggle switch to your amp. Just like when you mounted ...
Now is the time to make your amp circuit. You can take pretty much any audio amplifier Integrated Circuit (IC). I took the LM1877 because I had it lay...
After making your amp circuit, go on by soldering two wires to your speaker, each about 20cm/8inches long, and attaching male header pins to them.
Now add the power to your amp: Depending on the max voltage of your IC you can attach 9V-18V to your amp, perhaps more. For the LM1877 with a max volt...
Lastly, connect all header pins to the circuit board. Watch for polarity!
You are finished! Take your speaker box, hold it in your hands and be proud of yourself. Now calm down and check if everything is connected the right ...
Now you have built your speaker box but there are many ways to improve it. For example you could: Add a volume control Add a plug for externa...
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