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Battery Monitor Alarms Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, July 18, 2008 11:34 AM
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  • 9v Battery Voltage Monitor uses a LTC1440 comparator
    This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts.  It uses a LTC1440 comparator, which also contains a 1.18v reference diode.  In standby mode, the circuit draws only 4uA.
  • 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


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