$5 Vacuum Bazooka
This project consists of retrofitting a vacuum cleaner to fire a projectile through the usage of air pressure (or lack thereof). The parts: Vacuum cleaner, obtained from a garage sale, 12″ wooden dowel, 10 feet PVC pipe, and Tee fitting for the pipe. I’ve seen bigger versions of these do some amazing things like send a ping pong ball through metal cans. Link.
Great use for that old drive! MuCoP allows you to play your favourite music CDs on an “old” PC CDROM drive, instead of throwing it away. It consists of the bare essentials: a PIC microcontroller (16F877), 6 push-buttons, stereo audio amplifier (TDA2822M) and a few discrete components, not forgetting the IDE CDROM drive.



