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Battery Monitors Page 1
Battery Monitors: #-D E-R
S-Z
Last Updated on:
Wednesday, April 30, 2008 12:16 PM |
| Circuits Designed by Dave Johnson, P.E. : |
- 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
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. (added 7/06)
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Battery Monitors: #-D E-R
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