Hi,
I need to have a regular LED (doesn't need to be anything special like a superbright LED) stay lit as long as possible on either a single D cell or two D cells. D cells are rated for about 20.5A if used down to 0.8V. I'm assuming I would need some sort of regulator to do this... I think a regular LED is 20ma forward voltage 1.9v ?...
Thanks,
SA Dev