Description
Here is a easy to build low battery
level indicator circuit that produces a visible indication by flashing a
LED when the battery voltage drops below a predetermined voltage.The
circuit is based on Panasonic’s IC MN13811G and a efficient flasher
based on transistors Q1&Q2.Here when the battery voltage drops below
2.4 V the output of the IC is activated and the flasher starts
flashing.This circuit here is an ideal one for monitoring the level of
all types of 3V batteries.The circuit is power efficient with a idle
current drawing as less as 1 uA , and a current drawing while flashing
as less as 20uA.
Circuit Diagram with Parts list .
Battery Level Indicator Circuit Diagram
Notes.
Assemble the circuit on a good quality PCB or common board.
Do not keep the soldering iron tip on the IC’s pins for long time.
IC MN13811 series are available with
different trip point voltages( from 2.4V t0 4.8V) ie MN13811G to
MN13811U .If you need a trip point other than 2.4 shown here, you can
choose the corresponding IC from the data sheet and use it in the
circuit here.
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