how to make a dynamo battery charger?

i settled on using my old drill as a generator but the power just goes into the drill instead of the batterys do i need a diode and what sort?
by the way the drill is 12.5v

Re-design4 years ago
YOu have to use a diode in line with the battery to prevent the powerthat you're trying to force back into the battery from pushing it's wayback out and trying to make the generator into a motor.
sharlston (author)  Re-design4 years ago
pointing towards the battery?
The arrow should be point to the pos. term of the battery.

Get More Out of Instructables

Already have an Account?


PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!