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I've got one of these, I just wanted a way to build a stronger version that would be tune-able or the unit adapted to the tweeter speakers.
The trick is to have the unit automatically turn on when the dog barks, so it trains the dog into keeping silent.
I'd probably just gut one of those and run an amplifier before the speakers.
Though you might be able to find a db meter/sensor on an electronics site.
Radio shake probably won't have them