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More  LED Flasher Circuits     LED Circuits

LED Flasher  - Universal 3V Flasher Circuit
designed by David Johnson, P.E.

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.
The circuit relies on a cheap 74HC14 hex Schmitt trigger inverter IC.  One inverter forms a pulse generating oscillator.  Other inverters are ganged together to increase the drive current.  A two transistor circuit design forms a constant sinking current controller.  See the schematic below.

Click on Drawing Below to view PDF version of Schematic

Circuit Circuit LED Flasher circuit designed by David Johnson, P.E.


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