[sdiy] 555 noisemakers

[wwcarpen]

Hello, recently we were discussing a circuit I built,maybe you might find it 
interesting. It should be incredibly easy to build (that is if you can follow 
my messy schematic...)the power source is a 9v battery.

http://www.inpuj.net/~wwcarpen/science/wwcarpencircuit/wwcarpencircuit.html

>I need a very small portable noise maker so I've decided to breadboard a
>555 based design I found in a good ole' Forrest Mims book :) Has anyone else
>experimented with the 555/556 chips for noise/sound effects?
>
>                -John