Get one cd or mp3 player with its own speakers and another cd or mp3 player with self powered computer speakers and set them both to play a loop. One will continually play background sound of breathing and be heard all the time and the other wil continually play the loud monster noises but will only be heard when power to it's commuter speaker is provided current.
You will trigger the monster noise with the same cercuit as the motor that will provide the shaking of the box. The sound will go off and on as power is switched off and on to the SELF POWERED COMPUTER SPEAKERS not the mp3 or cd player. The simplest way to synchronize the loud noise and shake motor is to have them both plugged into the same power strip that is energized by whatever trigger you use. The most fun trigger would be a remote, like used on Christmas trees.You can do a better job turning it on and off than any sensor.
F. Wayne Johnson,Morganton, NC
Youth is fleeting but immaturity can last a lifetime, (if you are very lucky)" FWJ
Last edited by Aquayne; 04-12-2012 at 08:05 AM.
Reason: Added info