Building Faraday Flashlight Help

[psionicarrow]

Homework Statement

I need to build a faraday flashlight and I have two problems.

Homework Equations

(1) When I use a 12V DC motor connected in parallel to a capacitor (16V 2200uf) and then to an LED assembly, I can't get the capacitor to charge. (2) If I wanted to use a magnet and coils connected to a wave bridge rectifier and then to a capacitor and LED, how would I calculate the amount of Voltage produces by moving the magnet?

The Attempt at a Solution

I've already built a flashlight with the DC motor, it is able to turn on the LED but the capacitor just does not charge. I've put in a switch between the capacitor and LED and all I can get it to do is light up when I'm turning the motor and the switch is on; when the switch is off I turn the motor but when I flip the switch on the LED doesn't light up. Could the problem be that my capacitor is too large?

 

[berkeman]

Can you post a schematic of your circuit?

 

[psionicarrow]

 

[pellDwhy]

I think you can see this http://www.lightflashlights.com/ . It's very well. And I think that it's very useful.