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Battery Monitor Circuits
Designed by David A. Johnson, P.E.
Last Updated on:
Tuesday, October 13, 2009 01:26 PM
Master Category List - Dave's Circuits
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- 3 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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- 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.
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More Battery Monitor Circuits
Master Category List - Dave's Circuits
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