The Genecon motor/generator is a motor or hand cranked DC generator that is used to drive another ... The apparatus is small, but the handle motion and lights are visible in large lecture halls.

With six commercial 400F caps and a custom-built balance board, the bank takes a charge from a cheap 24V hand generator. The output is either to a heavy-duty lighter socket or some automotive ...

But what happens when there is no handy mains supply to recharge it from? Step in [Chleba], with a hand cranked generator. There are plenty of hand cranked generators to be found online ...