Universal 3v LED Flasher #1

Published:2012/9/6 20:41:00 Author:Ecco | Keyword: Universal , 3v , LED Flasher | From:SeekIC

The 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 forms a constant sinking current controller. Source: discovercircuits



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/LED_and_Light_Circuit/Universal_3v_LED_Flasher_1.html

Print this Page | Comments | Reading(3)