Circuit: THREE VOLT LOW BATTERY VOLTAGE FLASHER__ Circuits designed by David A. Johnson, P.E.

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THREE VOLT LOW BATTERY VOLTAGE FLASHER

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

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