Advent Calendar of Circuits 2011: Day 21: Forever Flasher

Advent Calendar of Circuits 2011: Day 21: Forever Flasher

Day 21: Forever Flasher An ultra-low current 1.5 volt LED flasher circuit. OK, maybe not "forever", but it should blink for a very long time. Burkhard Kainka helped popularise this circuit, but I am unsure who developed it originally.