Circuit: #401- Ultra Low Current 3V LED Flasher #3

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Ultra Low Current 3v LED Flasher #3 -- February 26, 2011

This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super efficient green LED from King Bright. The 3v powered circuit forms a classic pulse generator circuit, which drives the LED. The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua.

This means the average LED current is only 1ua. The overall current draw from the 3v supply is only about 2ua. This circuit might be handy to include in a flashlight, to it can be located in the dark. The current draw is so low that the circuit can be powered by a tiny battery for years.

Click on Drawing Below to view PDF version of Schematic