![]() Please sign in or create an account to comment. For energy conservation, connect to battery via a pushbutton (Push to Test). LEDs are used to indicate the water level sensed by LM339 and resistors are used for current limiting and create voltage dividers in this circuit. Monitor the level of your 12v battery and know when its. ![]() Note that the relay is driven by a power transistor. XD-82B 12V Battery Level Indicator Module 4 Paragraph 4 onboard Battery Indicator LED Lights. It seems to go to a state where it is half on, instead of being either on or off. 12v Battery Voltage Monitor using LEDs and LM339 comparator. Even with hysteresis it switches the relay so fast the relay melts from the arcs. The overall current drain as shown is about 25mA which tends to be wasteful for continuous operation. 1 So I'm using a lm339 comparator to switch my charger on and off for my 60v battery. This current can be adjusted simply by varying the series resistors (R9 through R13). The LEDs are biased to operate at about 4mA which is quite bright if modern LEDs are used. Document Information click to expand document information. This circuit will work if the voltage goes about 14 v and below 10v ( you can adjust the voltage of indication using Preset ). 0 ratings 0 found this document useful (0 votes) 2 views. D7 protects against reverse battery connection. Battery Level Indicator - Free download as PDF File (.pdf), Text File (.txt) or read online for free. The main component of this voltage level indicator circuit is an LM339 IC which is a quad comparator IC that has 4 comparators. ![]() The comparator sections have open collector outputs that simply function as switches to operate the LEDs. U1 is an LM339 quad comparator that compares the various voltages from the two dividers. Onboard 4-Bit Power Indicator LED Lights, Divided Into. R7 & 8 form a voltage divider to that reduces the battery voltage by a factor of 3. Onboard High-Precision Voltage Detection Chip And Power Regulator Chip. Tied to this is a string of divider resistors (R2-6) that set the various fixed voltage levels. Of course, you may select your own colours if desired.ĭ1 is the voltage reference zener. ![]() Read More Access - All Members of delabs Electronics - Join. LM339 can work on single or dual supplies, it has a open collector. LM339 can work on single or dual supplies, it has a open collector output that can drive 15mA, low power consumption. So by using this circuit, we can increase the lifetime of battery. You can use this circuit to check car battery or inverter. This article explains you how design battery level indicator. For example six LED’s are glowing means battery capacity 60 remains. ![]()
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