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More  Battery Monitors  Flashers & Blinking Circuits  
Astable Oscillator Circuits

 

 

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

Circuit Under Voltage LED Flasher designed by David Johnson, P.E. (Dec 24, 1998)

More   Battery Monitors 
Flashers & Blinking Circuits    Astable Oscillator Circuits

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