you get me a pick of your junk pile and I'll help ya come out of ways of doing it...

alternators generally work best with water wheels (squirrel cage fans are particulalry good for that) and if youve got an old tape deck or dvd/cd player you can take the drive motor out of that and remount it on a desk fan and in about a 7 knot wind it will start generating, couple them together with a planetry gearset from jaycar then set up a spring balance to and a wind vane to tilt the thing out of the wind as the wind speed picks ups to prevent it from over spinning and your laughing, regulation of the voltage is as simple as a 1a bridge diode and a cheap variable voltage regulator kit. or you could pull the regulator pack off of an alternator