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You can use this to detonate a sonic grenade, firework, lights, anything! Super cheap and reliable, $5 project.
-Depending on what you want to do, I suggest you pickup an alarm clock (with sound) or kitchen timer. Both were $1 at Dollarama!
I picked up a 90dB window alarm, and was going to use that for a sonic grenade, then I found a 105dB personal alarm, and decided it would be better!
-This is where the fun starts, smash open the clock and the and locate the wires running to the tiny alarm speaker. -This will be a low voltage out pu...
Of course you could have used the timer if you wanted to make a count-down detonater... and instead of an alarm at the end of the relay, how bout an e...
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