Introduction: "Timed Soundie" or "12 Second Sound Grenade"!

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inspired by a combination of throwies, thinkgeek.com's "annoy-a-tron" and my recently discovered love for 555 timers, I've come up with this little guy. i call it the "timed soundie"

once the switch is flipped on the timed soundie, you have 12 seconds before it emits a nice loud and constant beeeeeeeeeeep, enough for me to hear throughout my whole house. on the underside of the soundie is a magnet, becuase throwing them to places people can't reach is fun!

note:
this instructable inspired in part by:
buzzer throwie
the original LED throwie

Step 1: The Nitty-gritty...

parts list:
10uF capacitor
2 3v button cells (cr2032)
1 M ohm resistor
piezo buzzer (about the width around of a 3v button battery)
555 timer
electrical tape
magnet

(this is my first time drawing a schematic, so tell me if its wrong!)

the legs of the 555 are bent out and the whole circuit wraps around the buzzer.

all of the parts are soldered or taped directly onto the 555 or the piezo buzzer. the wires soldered onto the circuit going to the batterys are just taped to the top and bottom of a stack of two button cell batterys. like a soundie sandwich, a battery is added and taped to the bottom. (this is optional, incase its just being used as a sound grenade to bother people or for use in an airsoft or paintball scrim)

NOTE: the buzzer's + should be connected to pin 3. the - is connected to pin 1.

Step 2: Throw It!

i've found these little guys do a suprisingly good job at sticking to things. you obviously can't chuck them like you would a throwie, but a nice loft will generally land you a stick. just be sure to flip the switch before you toss it ;-)

(if just being used as a sound grenade, be sure to pad the little guy; he's probably fragile!)

thanks for visiting my first instructable, and please visit my website: lioorg.com