The eccentric thinkers at asciimation have developed a phonograph using the Arduino. In the steampunk tradition, the turntable is steam powered and made from scrap parts. The speed is controlled by the Arduino using six magnets and a coil as a pickup. They use the PID controller library in controlling the servo based on the input speed. The Arduino drives a servo to move the throttle to maintain the speed at 33-1/3 RPM.
To add an equal measure of punk to the steam, the LP they tested it with is The Sex Pistols “God Save the Queen.”
For details on the project visit asciimation.