Thanks for the reply, and the link - very interesting. I like the idea of using LEDs in the rectifier. Obviously I don't fully understand how dynamos work. Time to finally think about how they drive a current.

My obsession with voltage regulation stems from the rather restrictive specs of the front LED light I'm using, also the voltage meter I added requires a voltage within a meagre 0.5v tolerance. I wouldn't be surprised if they make it as friable as possible to sucker all the cheapskates like myself.

Given the current status of the light I'll probably just try the embarrassing 555 flasher circuit approach. I do have a left-over 6v dynamo, so I'll perhaps build your circuit or test those on that website.

Cheers.
AR.