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ATX computer power supplies are in almost any old desktop computer case you may have sitting in your attic or closet collecting dust.
These power supply's have at least 5- 12v, 8-5v and 4-3.3v leads all running with enough amperage to run any motor, arduino, servo or light setup that you have. Just one of these power supplies could run your entire haunt! One of the problems a lot of tinkerers run into is that when you remove the PS from the computer case (particularly when you unplug it from the motherboard) it will not power up. This is easily fixed by connecting the green wire to any black wire:
This single 250 watt PS I found in my attic is (currently) running 3 lasers, 4 wiper motors, an arduino controlling 4 servos, 3 mp3 players and 3 speakers!
My plan for next year is to have my entire yard haunt run off 1 powerstrip so I can shut down the entire thing with one switch.

These power supply's have at least 5- 12v, 8-5v and 4-3.3v leads all running with enough amperage to run any motor, arduino, servo or light setup that you have. Just one of these power supplies could run your entire haunt! One of the problems a lot of tinkerers run into is that when you remove the PS from the computer case (particularly when you unplug it from the motherboard) it will not power up. This is easily fixed by connecting the green wire to any black wire:

This single 250 watt PS I found in my attic is (currently) running 3 lasers, 4 wiper motors, an arduino controlling 4 servos, 3 mp3 players and 3 speakers!
My plan for next year is to have my entire yard haunt run off 1 powerstrip so I can shut down the entire thing with one switch.