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Universal Battery Tester

To recognize the battery whether it is working or not is very difficult. Generally voltmeter is employed for checking purpose of state of battery. Now, here is very simple circuit utilized to check the state of battery.
Circuit Description
The entire circuit of universal battery tester is build around dual comparator IC TL072 (IC1) followed by other component. The two independent comparator is used here as operational amplifier. The inverting pin of these two operational amplifiers is fed through potential divider network made from resistor R1 and R3. Rest of the component is utilized to maintain threshold voltage.
State of LED
Glowing RED LED:- Battery is fully charged
Glowing GREEN LED:- Battery is usable
Glowing RED LED:- Need charge or it is not usable.

universal battery tester

PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon unless stated otherwise)
R1, R3 = 5.6 Ω
R2 = 3.3 KΩ
R4, R6 = 1 MΩ
R5, R7, R9 = 1 KΩ
R8, R10 = 820 Ω
R11 = 10 KΩ
Semiconductors
IC1 = TL072CD
ZD1 = 3.3 V/500mW
LED1 = RED LED
LED2 = GREEN LED
LED3 = YELLOW LED
Miscellaneous
SW1 = Push to on switch
Two probe

11 thoughts on “Universal Battery Tester”

  1. can u please specify the value of the variable resistor VR1 used in the above circuit….actually Iam working with the above project and iam unable to select the value of VR1!!!!!!!!!1
    KINDLY REPLY ME AS SOON AS POSSIBLE!!!!!!!1

  2. can u please specify the value of the variable resistor VR1 used in the above circuit….actually Iam working with the above project and iam unable to select the value of VR1!!!!!!!!!1
    KINDLY REPLY ME AS SOON AS POSSIBLE!!!!!!!1

    ..

  3. Hi, the schematic here shows a pot labeled as VR1, but there is not value attached to it. Which range of pot should I use?

  4. Concerning the project of the website i have placed above, there seems to be a problem with the values of R1 and R3. Is it 5.6 ohms or 5.6 kiloohms. Furthermore, the red light signifies that it is fully charged and the green light signifies that the battery is usable. What does the yellow light signify? Three more things. What is the value of the potentiometer needed to make the circuit work? I myself, i am using 10 kiloohm potentionmeter, is this good enough? The green LED never seems to light since the voltage difference passing through its terminals is less than 1.2 V which is insufficient to light the bulb . Last of all, this circuit is designed to handle all sorts of batteries or there are some exceptions? (can it be used to measure the state of 1.5V 3V 9V and 12V?)

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