LED Volt Meter

Posted on Feb 6, 2014

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 Zene

LED Volt Meter
Click here to download the full size of the above Circuit.

r 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.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Light Transmitter
    vhf video transmitter circuit
    Boost Converter With Usb Power Switch
    elp needed making changes circuit
    Control cables plus anti-interference capacitors
    Nickel-cadmium battery fast charger temperature control circuit