Flashing battery monitor

Flashing battery monitor circuit diagramHere is a simple battery monitor circuit in which the LED will continue flashing until battery voltage is above the level. Transistors Q1 and Q2 are wired as an astable multivibrator circuit. This flashing battery monitor circuit can operate from a variety of voltages from 6V to12V.

The voltage level at which an LED stops flashing can be set by adjusting R4.  When the a preset battery voltage reaches threshold flashing frequency decreases andwhen the voltage drops below the threshold of the diode D1 LED turns OFF. This is used to compensate for changes in voltage of the base emitter Q1 due the changes in temperature.

Flashing battery monitor parts list :
R1 : 220 ohm
R2 : 120K
R3 : 5.6K
R4 : 4.7K variable
R5 : 33K
R6 : 680K
R7 : 220 ohm
R8 : 100K
R9 : 180 ohm
C1 : 4.7uF
C2 : 4.7uF
D1 : BAT46
D2 : LED
Q1 : BC547
Q3 : BC557


Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 12v battery monitor battery monitor circuit battery monitoring Flashing battery monitor simple battery monitor

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