Disclaimer: DO THIS ON YOUR OWN DISCRETION AND RISK AND THAT YOU WILL BE SOLELY RESPONSIBLE FOR ANY DAMAGE OR INJURY.
Here is what you need.
Medium Fedex box.
Two VHS tapes.
PC Fans. ( I use two 120mm Antec 3 step speed control Quite fans)
PC ATX power supply.
Small zip ties.
Large zip ties..
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Signing UpStep 1Cut the box
Cut the box like the picture.
Start with the bottom part that is going to rap around the box.
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usb ports can only supply 500mA, motors draw heaps.
click Here
http://en.wikipedia.org/wiki/Operational_amplifier
And thanks for replying to my 3 year old comment.