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PLEASE HELP!! (sonic grenade)

I'm trying to make an insanely powerful, directional sonic grenade. all I need to know, is how in the world to get something smaller than my fist to put out between 300 and 600 DB however, there is a small catch. I want it to put out a pre-recorded sound that I designate. not just a random beeping.

1
jakee117 says: Nov 3, 2007. 7:10 AM
one word - Google lol that probably wasnt very helpful was it?
12
VIRON says: Nov 2, 2007. 12:09 PM
A handful of old smoke alarm Beepers? ((@@)) ! Radio Shack USED TO sell an extreme variety of them!
18
royalestel says: Nov 2, 2007. 9:55 AM
Yep, or 3 or 4 whistle key finders.
32
Lftndbt says: Nov 2, 2007. 5:42 AM
How bout a $5 Personal alarm? They have a pull switch already and are damn loud... Enclose three in a capsule and link all they magnetic pull switchs together... You would have your 400+ db fist sized sonic grenade... You could then experiment with a fragment version where the three units smash apart on impact sending blarring units everywhere!
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