Tutorial for an easy DIY 5-Min. timer-switch set to emit a sound.?

I am trying to make a few game-types for my friends and I to play in airsoft, and one is a variation of the classic FPS game-type called Assault.  I am wondering if there is a tutorial for beginners that explains how to create a DIY Timer Switch that will emit an explosion sound 5 minutes after it is set.  I want to make a false bomb for us to use, but I am unsure about how to do that. 


aeronut015 years ago
Hope you know something about electronics! Go to this url: http://www.eleccircuit.com/wp-content/uploads/2007/11/lm555powerdelay.gif     Look at the second circuit (the one in the middle).  You can power it with a 9v battery.  Place an on/off switch in the circuit, so that to 'arm the bomb', you simply open the case or whatever you put this circuit in and turn on the switch.  to disarm, the other team has to flip the switch off before the timer activates.  Then you can simply wire up another 9v to a buzzer, with the relay interrupting the connection between the buzzer and battery.  When the timer finishes counting, it will turn on the relay and sound the buzzer.  you'll have to play around with the values of R1 and C1 in the circuit to adjust the timing period.  to get a recording to work, build this circuit and buy this:http://www.radioshack.com/product/index.jsp?productId=2102855     Record your explosion sound to it, then wire the relay to the playback button.  when the timer finishes counting, it will turn on the relay and simulate a 'button press', triggering a playback of the explosion sound.  I have personally done the first circuit (with the buzzer), the second one (for the recording) should work as well (in theory...).  Good luck.
aeronut016 years ago
By 'explosion sound', do you mean a recording of an explosion sound or will any sound do (i.e. a buzzer)?
bighead5454 (author)  aeronut016 years ago
Either, it doesn't matter, though a recording would be better.