A_continuous_15_V_indicator

Published:2009/7/19 22:58:00 Author:Jessie | From:SeekIC

This LM3909 circuit shows a continuously appearing indicator light that is powered by 1.5 V. Duty cycle and frequency of the current pulses to the LED are increased (from that of Fig. 12-43B) until the average energy supplied provides sufficient light. At frequencies above 2 kHz, even the fastest movement of the light source or the observer's head will not produce significant flicker. This indicator draws about 12 mA from the 1.5-V battery, and is not intended as a long-life system.



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