Ok, from what I can figure out you get the tigger sensor/pad, connect it to some sort of electronic drum kit module/midi unit etc... which then connects to the PA system. Not sure how helpful that info is - you'd need to go to a music store and look at equipment for more info on specific equipment, but essentially. They can be home made, there is a video on youtubve appaently of a guy using a guitar pickup as a drum trigger, because they are essentially the same thing.
There is another one where a guy takes that idea a little differently, and uses triggers to make a drum kit out of an apple, a carrot and a wallet.
The reason they are considered cheating by alot of drummers is because it doesn't matter how hard you hit, it will sound the same out of the PA. It's essentially to make sure the sound is always the same, because the sound is actually artificial. So, when playing fast, drummers will barely tap the kick/drum/snare, instead of needing any real power, and it will sound just fine. They can also be setup if you wanna really cheat to play two sounds, so 1 hit on the kick, will play a double hit through the system - this is cheating to the maximum degree though.
Head over to the ddrum wesite for an example of a top level setup, or Roland here http://www.rolandcorp.com.au/default.aspx?prdgrp=24. The link to the ddrums website is useless, as it just takes you to their frontpage anyway, which you could figure out on your own.
I hope any of that was helpful
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