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How do you make a sound activated switch?

So basically I'm looking to make a circuit that detects a (preferably adjustable) level of sound and completes another circuit and keeps that circuit completed until the sound level drops.  I've looked around on Google but I cant find any momentary circuits.  I find things like clapper kits and stuff that switches something on and keeps it on.  I want to use this on my paintball loader so when it detects the sound of the gun firing it activates the motor.  (like a Halo or some other high end loader)  The loader is a Viewloader force with the ON-Demand jack.

+One last thing this cant be too huge because I want to be able to velcro it to the side of my loader.  If you know of a circuit like this or have a picture or a link That would be great; thank you all in advance :D    

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4 answers
Jan 10, 2011. 12:23 PMKiteman says:
Rather than rely on a complex (ie potential failure) circuitry, why not simply arrange a switch on the trigger?

Pull the trigger, wires contact, motor starts.

Jan 10, 2011. 1:15 PMKiteman says:
Don't forget: K.I.S.S.

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