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2_kHz_FLASHER_FOR_LED

2017-02-03 16:31  
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2_kHz_FLASHER_FOR_LED
2_kHz_FLASHER_FOR_LED
Single 1.5-V cell provides power for National LM3909 flasher IC that operates at high enough frequencyto appear on continuously, for use as indicator in battery portable equipment. Duty cycle and frequency of current pulses to LED are increased by changing external resistors until average energy reaching LED provides sufficient light for application. At 2 kHz, no flicker is noticeable.-P. Lefferts, Power-Miser Flasher IC Has Many Novel Applications, EDN Magazine, March 20, 1976, p 59-66.