universal battery tester

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.

  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.

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