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This circuit is designed to monitor two alkaline cells (3v) that form the battery
often used in portable electronic equipment.
It use an inexpensive IC from Panasonic that is
connected to an efficient LED flashing circuit. When the battery voltage
drops below a certain point the circuit flashes the LED.
In
the off state the circuit draws only 1uA, while in the active flashing state it draws
20uA. Published in EDN, Jan 2, 1997
Click on Drawing Below to view PDF version of Schematic
