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Circuits designed by David Johnson, P.E.

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Last Updated on:  07/25/2009 07:09:05 AM

Battery Monitors  Flashers & Blinking Circuits Astable Oscillator Circuits

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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

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

Battery Monitors  Flashers & Blinking Circuits    Oscillators:  Astable Circuits
Master Schematic Category List - David A. Johnson, P.E.
 
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