18_V_MONITOR

Published:2009/6/29 22:47:00 Author:May | From:SeekIC

Circuit turns on LED when ±8 V battery pack discharges to predetermined low level, while drawing less than 1 mA when LED is off. Zener is reverse-biased for normal operating range of battery. When lower limit is reached, zener loses control and Q1 becomes forward-biased, turning on LED or other signal device to indicate need for replacement or recharging.-W. Denison and Y. Rich, Battery Monitor Is Efficient, yet Simple, EDN Magazine, Oct. 5, 1974, p 76.



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