i made a nice flashing circuit that works off of very low voltages....down to 0.9V, and uses a low voltage 555 timer IC..you can adapt it to your use. the schematic i posted isnt the design of the board...the board design is more complex because i needed control over duty cycle as well, not just frequency. and the mosfet really isnt needed if you arent driving a Luxeon, like me, i think the timer can output up to 200ma if i remember.
Le>> Hi