Today, I hacked a multi-function audio player (commonly known as a "boom box") to add an external audio input. This hack isn't really done yet (I still have to solder everything up, drill a hole, add the 1/8" jack, etc.), but I have pictures of what I've done. Essentially, I started out by poking around the live circuit with my oscilloscope. I didn't get very far with that, so I decided to look up the datasheet for the identical DIP chips that looked like they were the amp chips. After readin...
