Instructables
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Modifying an old amplifier/speaker for a separate input using wire clips instead of a stereo jack.
 
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Step 1: Disassembly

Picture of Disassembly
Here we have the base audio amp and speakers from the bottom of an old Dell CRT. We're going to add an additional input to this so that we can push through sound from our MCU projects and other things that a stereo jack is too cumbersome for.
You have to remove the two back feet to access the last two screws and get the cover off.

Step 2: Soldering

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Here you see the soldering job. Two tips: I marked the three wires with dashes of marker (not visible) to make certain I knew which was which; the other tip is to just strip away the top layer of plastic with the blade of a regular screwdriver. Then, you just solder the wires on, adding a little extra solder to the joints. You might want to tape the wire down, as I did, just to get it out of the way when you put the lid back on.

Step 3: Routing

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Those "sound tubes" that come out of the back are actually good for something! In this case, I routed the wire right through this one.

Step 4: Reassembly

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Be careful to keep the wire out of the way, and put the screws and feet back in.

Step 5: Fin

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There you have it! A simple modification that allows a great deal more flexibility for sound sourcing! Have fun!
Why not add alligator clips to an audio plug? It would be portable, just as easy, removable, and wouldn't void your warranty.
ironsmiter7 years ago
nice idea... I'd put stereo rca jacks on instead, but that's just me :-)
petmar (author)  ironsmiter7 years ago
I might have as well, but for temporary connections, and also due to the fact that I always have problems with audio cable strain reliefs, I thought this would work better. However, I might still add a revision with optional RCA jacks as well. Thanks for the suggestion!