Baybus

The idea here is to produce a small box which should alter the voltage of the fans with some switches. The fans are those that cause most of the noise in a computer, so decreasing their voltage causes a decrease in revolutions per minute, and therefore a reduction of noise. The efficiency is also decreased, but this is taken in consideration by allowing the user to switch between levels of voltage Detail...

Cheap Power Supply for Experimenters

From: Hotsolder - Electronics & Other Geeky Pursuits - Link.
How'd you like a high-quality regulated 5V and 12V bench supply for $8 or less? You have to build it yourself, but you won't even need a soldering iron. Sound interesting? Well, there is one small catch, but read on and you might find you have everything you need already on hand.

Many hams and electronics experimenters have PCs today. An increasing number of these are finding use on the workbench. Many hams program microcontrollers, use a PC-based oscilloscope, or just use the PC to control equipment around the shack. This is becoming even more practical as the resale value of computers keeps dropping. More and more, you'll find it hard to get rid of a PC when you upgrade. You might as well find a use it around the shack. Detail...
Related:

• ModLab PCs laboratory power source from MetkuMods Link...
• Convert an ATX Power Supply Into a Regular DC Power Supply! instructables.com Link...
  

Desktop Power Supply from a PC

By Andy.Batts@MurrayState.Edu
This ATX PS board has leads for +5 (RED), -5 (WHITE), +12 (YELLOW), -12 (BLUE) volts, Ground (BLACK) and switch (GREEN). Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes. The fan has also been unplugged for better viewing. Since this PS was converted for use in the logic and robotics labs, the selected voltages were tapped. Other users may want combinations of +3.3 V (ORANGE), +5 V and/or +12 V if they are converting one of the newer supplies. For R/C applications, the 5 volt output can also serve as a desktop source to drive receivers and servos. If used as a power source for the micro and sub-micro servos, you must be careful not to drive the servo to either endpoint to avoid stripping the smaller gears in these units. Most standard servos have sufficiently robust gear trains and will simply stall if pushed to the mechanical stops. More...

See Also...

• How PC Power Supplies Work at Howstuffworks - Link.
• PC power supply conversion and Power supply From Silent Q - Link.
• About ATX Power Supply From My Electronics Hobby - Link.
• ATX and ATX P4 Power Supplies @ bluemax.net - Link