Need a mecanical generator for experimentation.

[mzr99]

I need a manual generator.

(i.e.: A gadget that generates electricity by using some mechanical energy).

It has to be small - but not miniature.

Also, I need it (if possible) modular, so one can attach other devices to it (to provide it with the mechanical energy)

I would like it not to be too expensive.

I would appreciate any pointers.

Thanks in advance.
[al]

[russ_watters]

Any electric motor is also a generator.

[mzr99]

Thank you.