> Well currently I use a dynamo (this is a very old bike, 20-30 years
> or so) and it has filametn bulbs front and rear, what I would like is
> a constanst light output no matter how fast I bike, which is not the
> case atm, and light when the bike isn't moving, in case you have
> to stop for traffic or something. One idea would be to have the
> light on for about a minute after the dynamo stops charging.

> I was browsing maxim earlier for those battery ICs, found a few,
> most were programmable by an SMB bus, I'd rather keep this
> as simple as possible

Patrik, the first decision you need to make is whether you stick
with filaments or change to LEDs. That will then help you decide
what back-up supply to use. If you stay with filaments, a supercap
won't do it (two bulbs could use 1500mA). Go to LEDs and you'll
find the current requirements drop dramatically to 20-30mA, which
could be supplied by a battery or supercap. I think this is really a
case of putting aside a Saturday and as Nike would say, just do
it ;-)   BTW, are you using a hub or friction dynamo ?

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