Flashlight with no batteries

Step 5 Prepare the motor connector

Solder the four diodes to the contacts of the individual coils of the motor in the male connector and a small piece of wire to pin cable which connects the common of the four coils.

Comments

[skrubol]

I think if you didn't use the common wire, and added another set of 4 diodes in the opposite direction, (with the cathodes all connected to the - line,) you'd get double the voltage. In your config it looks like you're only using the top half of the sinusoidal outputs of the stepper: half wave rectifier. If you used 8 diodes, you'd have a +, a - and the common would be ground (which wouldn't be needed.)