I suppose the only "instruction" here is an interesting pair of parts at a good price, since you couldn't get much simpler on assembly. But hey, if it's OK for the throwies, then why not this?
I'm hoping that someone more creative than I will find a good application for this. Noise grafiti? Halloween noises?
Step 1: Buy $5 MP3 player
for a really cheap MP3 player. BG Micro is selling MP3 players for $5/ea, quantity 3 or more. I bought 3, I figured I might pull one apart and see what kind of parts they have. You can order this part at http://bgmicro.com/search.asp?textsearch=AUD1081. If you put in 3 or more, it should give you a $5/per total instead of the $5.95.
Incidentally, I didn't get the first order they shipped via US Priority Mail. I emailed their sales people, and they just reshipped without any hassle or suspicion, nice people.
Open your package, and extract the MP3 player holder in all its glory.
Step 2: Examine the bits of the $5 MP3 player
Step 3: Wonder about the headphones
Step 4: Separate battery holder from drive, put sound on it
Insert the USB drive into the USB port of your computer. Copy one or more MP3 files onto it. For this project, I used "Wailing Paddle" by the Rudiments: