Published:2009/7/14 21:29:00 Author:May | From:SeekIC
Uses Litronix RCL400 current-controlled LED having built-in voltage-sensing IC that turns on LED at 3 V and turns it off at 2 V. Use suitable zener or string of forward-biased silicon diodes to make VZ equal to 3 V less that VCC. Thus, for 4.5-V battery, put two silicon diodes in series with LED to make VZ 1.5 V across them.-S, W. Hawk-inson, A Battery Voltage Monitor, 73 Magazine, July 1977, p 52.
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