LED Volt Meter

Here is a Simple LED
Volt meter to Monitor the charge level in Lead Acid Battery or Tubular
battery. The terminal voltage of the battery is indicated through a four
level LED indicators. The nominal terminal
voltage of a Lead Acid battery is 13.8 volts and that of a Tubular
battery is 14.8 volts when fully charged. The LED voltmeter uses four Zener diodes to light the LEDs
at the precise breakdown voltage of the Zener diodes. Usually the Zener
diode requires 1.6 volts in excess than its prescribed value to reach
the breakdown threshold level. When the battery holds 13.6 volts or
more, all the Zener breakdown and all LEDs light up. When the battery is discharged below 10.6 volts, all the LEDs remain dark. So depending on the terminal voltage of the battery, LEDs light up one by one or turns off.

LED Volt Meter Circuit

LED Volt Meter Circuit Diagram

Author: D. Mohan Kumar
Copyright: electroschematics.com

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