Carregador de bateria
Silent Air Compressor - Homemade silent air compressor constructed from a pair of freon tanks, a refrigerator compressor, a pressure switch, and a regulator.
How to Build Ultra Quiet Refrigerator Air Compressor DIY: Silent Homemade Shop set up step by step - YouTube
DIY Silent Air Compressor
How to modify a fridge compressor into a silent air compressor
How to Make Mini CNC 2D Plotter Using Scrap DVD Drive, L293d Motor Shield & Arduino
Arduino-based Laser-cutter from used DVD-R drives!
38mm x 38mm Laser Engraver build using CD-ROM/Writer on ATmega328p
Laser cutting with 1 watt laser
Bandsaw - diy.: