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The electronic circuit below will flash any LED color with fixed
current pulses powered by a 3v battery. It uses a charge pump approach, which
routes a constant current pulse through the LED, regardless of the LED voltage
requirement. Using this approach, white and blue LEDs, which normally require about
3.6v can be flashed with a 3v battery. With the component values selected, the
LED is hit with 15ma current pulses lasting about 10ms every two seconds. This
keeps the average current draw from a 3v battery to about 200uA. |
