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Portable 12V Air Conditioner --Cheap and easy!
Make an easy guitar distortion pedal (STEP BY STEP!)
2 Arduino Powered RC plane
Accurate returning boomerang from plywood
Simple knock-down cardboard end table (flat pack)
Water Bottle Plant Waterer
Turn a Glass Coke Bottle in to a Plant Waterer
Indoor Automatic Plant Watering System
DIY solar cell from scratch
How To Build A Solar Panel